Try Sears. They have several good models to choose from.

She bought it from ProForm. I finally got a hold of them this afternoon, the wait time is horrible but they told me it's some kind of belt that needs to be replaced so I ordered a new one. The fun part will be putting it on...you have to tear the treadmill apart to get to the darn thing. Thanks for the suggestion. I have really enjoyed using it and am just frustrated that I have to wait. :0)

If she has a nearby gym, perhaps they could steer her in the right direction. It's hard to believe that the ONLY spray available is from a manufactor.

As Brickeye said it could RF induced. To check plug a resistive load, such as a lamp, into the receptacle to see if you still have the problem. If so, then it sounds like a different issue. I guess it is possible there may be a nail going through the say the neutral & one of the twisted wire pairs(keep in mind it might just slightly be nicked & when the treadmill runs the vibration makes the two make connections). Check the voltages on the phone wires while the treadmill is running. You may want to do another test as well. Plug a hair dryer into the receptacle & see if you have the same problem. This is an inductive load as well & will generate RF noise but without the vibration. This is a long shot but easy to check. Also, plug the treadmill into another receptacle on the same circuit to see if the problem continues. And then plug it into a receptacle on a different circuit. And to continue this debug process plug the DSL modem into a different phone line jack & test it, then a different receptacle but same phone line jack & test it, then a different phone line jack & receptacle & test it. This will help determine if the problem is "unclean" power going to the modem or if the phone line is having noise coupled onto it. Are you using the same duplex receptacle to power the treadmill & DSL modem? Are they on the same circuit even if not on the same duplex receptacle? How close is the receptacle to the phone jack?