Need to remove the cabinet and defeat the lid switch for testing. Check around the pump and drain hoses for leakage. Try spin mode with the pump removed to determine if obstruction in pump is the problem. If it still makes the noise and spins slowly, remove the motor and check the drive coupling. It is normal to not be able to turn the inner tub by hand as it is held in place by the brakes which are only released when the gearcase is working in spin direction. This video
will show you how to get the cabinet apart and remove the pump and check the coupler.