Camshaft actuator went bad

[meyergsr]

Had a check engine light for a few days. So I took the 06 H3 with 3000mi. to the dealer. They found the actuator to be bad and replaced, however part of it a plastic ring was missing and not in the top end of the engine. The mechanic had to remove the oil pan to retreive the missing part. I am a little leary of any damage done to the engine with parts floating around. Has any one else had a camshaft actuator go bad?