Sunroof Operation ??

[Ben Ballard]

The patient is a new to me 1990 200.  The sunroof exhibits the following behavior. The sunroof will tilt open with the motor, but will only close manually.  The sunroof will not slide open with the motor but can be opened manually.  Once open, the motor (rather slowly)  will close the sunroof.  Is anyone familiar with these symptoms?  Is the problem most likely with the switch?, the relay? the motor? other?

Any suggestions would be appreciated.