Yes the drum turns by hand. I remove the back off of the dryer. Nothing blocking the blower fan. It does not sound like the motor is running, just humming. The blower fan does not move when the motor hums.
Most service is performed by removing the front panel.
** does not sound like the motor is running, just humming **
No. And if the drum turns freely by hand, it isn't likely stopping the motor from turning so removing the belt and testing is probably unnecessary. I think your problem is likely in the motor itself. :(