Genie 880 Garage Door Opener won't open unless micro switches disabled.

Howdy All !
I have a Genie 880 that won't open unless the two switches on the screw drive housing are disabled by disconnecting the wires. When it does open after disabling the switches, the screw drive housing vibrates and the motor acts like it is straining to open the door (can smell overheating of motor). The door opens manualy with one hand but does take a little effort.
Any ideas?
Sowport
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Have you ever tried lubricating the screw drive shaft, or the hinges that worked with mine... Genie has an toll free number 1-800-654-3643 Barry/Austin
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