I haven't read the entire post, but from what is said it probably means one of the heating elements is broken. A dryer is a pretty easy thing to fix as there are not a lot of moving parts. a lot of disassembly is required but basically simple to do. If you have already had the back off you were almost there. There are wires to the motor the drives drum and the electronics that feed the heating units, unless it's a gas dryer in which case call in a specialist, don't mess with the gas connections. Actually on the drum driven by a narrow little belt. If your sure it isn't that and the belt isn't broken then it has to be the heating element(s). Those can usually be purchased and any hardware store or appliance store with your brand of dryer and are usually plug in.
EITHER WAY ALWAYS UNPLUG IT FROM THE ELECTRICAL CIRCUIT. If it is a giant plug that is a 220 volt electrical outlet. That can ruin your whole weekend if you accidentally make contact with that. As has been said, this is an older thread and by now I'm sure it has been repaired or replaced but hopefully this might be helpful to others.