Digital cluster on a 1994 Eldorado
 

I just had my car repaired at a local shop, I drove it home last night and noticed that my off & auto lights were not illuminated. The shop repaired the clutch on the air conditioner and replaced the serpentine belt, etc. I noticed that my clock was set at the wrong time so I know they did something to the electrical. I took it back this morning and they said the diode was probably out and to replace it would be $700.00. I suspect that they caused the outage. Any opinions would be appreciated.