I have had service done at Keystone Volvo-Isuzu in Landsdale. I had a bad rattle sound coming from the underside. They found a loose baffle in the muffler and replaced it at N/C. Yhe part had to be ordered which took 10 days. When the part came in, they installed it while I waited. (1 Hour). They were friendly and polite.
I would go back again for repairs. The person I dealt with in service was Ed. I hope this helps.

Howard