Either before you buy or after. I knew mt 98 B700 had a est in the heater. What a mess!! Open that up a see a mouse mess with definitely drop the value if you are pre inspected before purchase.OR you might not want that bus.
Yesterday i opened up the panel for all my switches on the left. Easy to open due to two chrome screws. Amazed and shocked at all the mouse chewed paper in it. A definite fire hazard for sure.I didn't find even one chewed wire.
I itch just thinking about cleaning that out.