I agree with David, it's too far removed from the AC line to have been
caused by a brownout. I have customers try to get me to write failures
due to outside influences, and I won't unless it's even remotely
possible, and then I write it up as a potential power related issue.
Items that are clearly damaged are written up that way.

Understand that if the power company or insurance company audits the
repairer's claim and finds fraud, this will be a very serious problem
for him and he might lose his license.

John