You need to first confirm what is actually occurring so you can work out whether it is a switch issue or a lamp issue.
Correct operation of right ramp is:
1. At start up, all 5 diner lights lit.
2. Shot to ramp opens diverter and starts timed stir the cup feature, all 5 DINER lamps flash during timer.
3. If you don't stir the cup, by the end of the timed period go back to step 1 above.
4. If you do stir the cup during timed period, then each stir of the cup simultaneously increases the score on the display and lights one of the DINER lamps. After you have finished stirring the cup all 5 DINER lamps extinguish.
5. Next 4 ramp shots awards increasing points 25K/50K/75K/100K and as awarded on display also lights DINE. lamps in turn.
6 Fifth ramp shot awards 250K, lights the R in DINER and starts timed stir the cup feature.
7. If you don't stir the cup, by the end of the timed period the 5 DINER lamps remain lit and you go back to step 2 above.
8. If you do stir the cup during timed period, then each stir of the cup simultaneously increases the score on the display and lights one of the DINER lamps. After you have finished stirring the cup all 5 DINER lamps extinguish and you go back to step 5 above.
If all the functionality and scoring works as above but the lamps just don't work as they should then you have a problem with the lamp matrix. To diagnose exactly what is wrong with it you need to describe exactly what is happening at each stage above. And you would need to know if there are any other lamps not working as they should, as the issue may not be confined only to the DINER lamps.