Remove the motor housing from the mechbox entirely (2 screws) with the motor still contained within said housing. See if the motor turns freely and then re-install the housing complete with motor. Put the 2 screws back in, re-install the grip (1 screw) and test the gun.
Age verifier Northern Alberta
Democracy is two wolves and a sheep discussing what's for dinner.
Freedom is the wolves limping away while the sheep reloads.
Never confuse freedom with democracy.