What year W123? There are two styles of sunroof motor, pre 82 and post 82, or something like that.

Both have a manual crank. Look in the trunk, driver's side. Oh heck with this, Im gonna take a pic, Ill be back.

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car