For side mirrors, check for the fuse first though chances of blown fuse is very low as the car was parked all the time but this is the max you can do by yourself....do you hear any sound after pushing the unfold button or its completely silent?...If you are not hearing anything then it must be the power problem..i mean there is no power coming to the unfold button...
for windows there are few guys who faced warranty issues regarding power windows..and they have even changed the power windows motor in warranty....it must have been checked under warranty if the problem was there for a long time...
i hope the previous owner would not have messed up with the electrical harness during sound deadening work...thats why i never like to let any kind of work done aftermarket specially anything that requires fiddling with electrical wires....
n e ways...its better to let it checked through the dealer...dont go blindly what they will say..just see with what problem they will come up..