A/C on shore power trips breaker after 30 minustes

The point of this site is ask questions/get advice/REVEAL the solution. It's helps all of us that may encounter a similar issue. That said, WHAT was the SOLUTION? What did you figure out?? If cutting the vent fins and changing the electrical cord were the solution, great. I think that electrical cord may well have been your problem, but doubtful on cutting the a/c cover opening....but didn't know if you used the voltmeter to verify.