Fantastic fan not working

The fan n my 2002 Carriage Cameo is not working. The drive lift motor is working fine but the dome won't raise. I removed the drive motor and turned it on as I said it's ok. I removed the plastic shield that has the switches etc. and I can reach the lift arm drive and turn the end of the lift arm shaft with my fingers with no resistance. I'm assuming at this point that the lift drive unit is junk ??? Anyone with knowledge of this your opinion would be helpful.

Thanks