Sorry, I moved your post to where I thought it would be more appropriate.
But as for your situation, hard to say if the mechanic is at fault. Could be something he did, or could just be coincidence. If he DID do something, you will never be able to get him to admit it. People with that much honesty are rarer than hen's teeth. I had a guy who worked on my C5Z try to claim that the washer that wound up a cylinder was the guy who worked on it previously's fault. Even though that was 6 months ago.
Unfortunately it's a dog eat dog world out there, and we always seem to be the little dog.
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