My CD drawer won't open please help ?

I have an intermitten problem w/my transport's drawer it won't open, from the remote nor the unit. I opened it up and every thing looks OK, but what do I know. I slabbed some grease on the rails and it opened again now it won't work :-( I even tried the old fashioned giving it a whack still the same problem. Of course I am leery about getting ripped off by techs with their inflated repair bills. Anyone experinced the same thing before? please share your thoughts and ideas
Thank you

Stan