Hi. I just repaired the same model yesterday. It's not so difficult. Remove the 5 deep screws from the bottom, and pull out all the buttons, so you can take the top off. Then remove the 4 screws from the bottom that are holding the clock module. Now you can take it out. That's not so easy, but there is just enough space. On the right you will see a round piece of metal. That's the motor that's probably a bit stuck. Probably when you plug the clock in, and you'll help the motor a bit, it will start turning again, but that doesn't solve the problem.
What I did, is taking the two screws out that hold the motor. That way you can remove it's cover. I sprayed some WD40 between the stationary and the turning part while it was turning. Then let it run for a while to make sure the WD40 reaches all parts of the motor.
Ofcourse, doing this is at your own risk. But for me it works, it's still running since yesterday and is still accurate.
Good luck!
Willem, December 2007