The owner will rarely try a new bulb so it's usually the end. They often want the shop to try a bulb and the shop won't unless the owner pays for the tech time and buy the bulb if it fixes it. You can see why there is a standoff there.

Given the age I suggest you dump it and move on. There are plenty of DLP repair videos and more on the web so I wanted to share this repair shop story and suggest the next move.