Getting back to factory settings on a Sansui SV-RP4312?

Hi, I have a Sansui rear projector Television (4312) and have recently had it 'repaired' as there was full sound and no picture. The chap replaced an entire module and left with the image showing a nasty curve at the bottom of the screen. promising to come back with information on how you return to the factory setting using the remote.
Can anyone advise me how I can get back to the factory settings myself?
Thanks
Claudia