Who should pay? Mechanic broke piece

I have a 97 Accord. The Accord’s of this age had a history with defective door lock controllers, but mine was replaced under warrantee. They did manage to put a chip in the trim piece, about a 1/4"x1/8" when doing the replacement, but I never noticed it till now. The answer is yes, this is a brittle piece and gets more brittle with age. BTW, the dealers cost to replace at the time (1998), was $200, to Honda.