As MacGYVER says I would agree about the backlight getting old. I already replaced a dead one on a Pismo a few months ago and it was a tough job. The lamp is so tiny and fragile that I broke one during installation but I had purchased 2 so I was able to finish the job.
For those who would want to try to replace their Pismo/Lombard backlight here is the link for the part:
and the link to order the part:
Digikey part number is: 289-1108-ND
Manufacturer part number is: BF20292-24B
backlight lamp is $16.12 CDN + shipping