Wear points are 1) the belt idler pulleys; 2) the main drum bearing at right center; 3) the left-side drum support bearings (ceramic bushings) on the air duct assembly. Less likely, the motor bearings. Being as load size (weight) has an effect, probably #2 and/or #3.

The main drum bearing can be replaced from inside without otherwise disassembling the machine. The other items require disassembly, which is different than other dryers and requires working space in front of the machine. The top deck raises up, the front panel comes off, remove the inner door closer mechanism and a few other wires, then the entire inner chassis tilts forward and out of the outer cabinet.

Whether you can do the repair(s) yourself depends on your mechanical ability. Parts are available via SearsPartsDirect.com, FisherPaykelParts.net (not related to F&P parent company), or possibly direct from F&P. I can send a service manual, but you don't have e-mail contact on your GardenWeb profile.