A one-time situation, limited in scope, that has been corrected should not give you a problem.
I'd first ensure the area above the ceiling is properly ventilated and that there is no leakage (roof and flashing in good shape, no nail-pops or unflashed roof penetrations). Check all surfaces for dampness, especially after a hard rain.
I'd then clean the surfaces with a spray of diluted Clorox (about 1:5) and keep an eye on the area for any return of the problem. Replace any removable material that is moldy (i.e. insullation).

Thanks randy for all the info, all very good. Yes I will send my husband up there again for further checking for possible leaks. There is no insulation up there as the underside of the bedroom ceiling is actually the concrete roof. However the upside was treated with an insulator. Thank you for the 1 to 5 ration on the bleach. That is the part we are nervous about cause the problem area is so high and don't want to ruin things in the process. I am guessing were going to have to tape off and plastic sheet everything like a Dexter kill room. LOL, sorry that's just what comes to mind, hope your a fan. We were thinking about steam! Does anyone know if we could possibly clean this area with steam? It's cedar wood and concrete sprayed with a texture surface.

Steam is not likely to be effective. You would need to heat the contaminated material to high temperature all the way through for an extended period. I don't know how you would do that to this structure. Note that I have no idea what "twin Ts" are.) The bleach will penetrate to a limited degree as well, but my guess it that it will work better than trying to steam it. I am still struggling with your description. Is there any way to post some pictures or do you have any links to similar structures?

I am afraid that your best bet might be to just concentrate on humidity control to keep it in check after you make sure there is no water infiltration. Keep in mind that humid air that might be sucked in due to pressure differentials created by the HVAC can cause condensation wherever the hot, moist air first hits a cold surface.

A few words on bleach. The concentration of hypochlorite is all over the place for some time now. It used to be a standard 6% by some convention. If you want to use the 5 or 10% figure, you need 6% hypochlorite in the bottle. The flavored varieties, as I like to call them, have a lower concentration so the added scents are not oxidized (degraded) by the bleach. Some shysters even market stuff as "ultra" that have lower concentrations than 6%. It is all a consumer rip-off. If you are in the store and forgot the 6% figure, check a bottle in the store that says "disinfectant bleach" on the label or has an EPA registration and buy the stuff that has the same or higher concentration that is least costly.

You could consider collecting a mold sample and sending it out to a testing service. I don't know for sure if they exist, but you could look around. Check their credentials if you do find one.

Keep us posted.

Ionized thank you so much for all the info on Bleach. I am a label reader. Sometimes I am in the grocery store for hours reading all the labels. I have NEVER read the label on the bleach. Good point on the "flavored" bleach will stop purchasing them. I never noticed the difference in smell with them anyway. I tried to find the figures on my bleach and I don't think I was able to find the figures but will just purchase regular from here out. Thank you for your other info. As for sending in the info to get it tested. I thought about that but I would not want to have some major issue with "BLACK MOLD" police later. So we will just try and treat it on our own. Thanks so much!