IMO the AC shouldn't be on a GFCI circuit, but apparently your's is and has been working like that since 2005. A GFCI circuit, whether protected from a breaker or receptacle, trips when it sees between 5 to 7 milliamperes of current difference from the amount of current that went out from the circuit to the amount that came back from the load. GFCI's do malfunction, there are testers to prove that they will trip as designed. It doesn't take much to trip a GFCI, that's how they protect your from electrocution, moisture is your worst enemy. You have severL options, test the GFCI, replace the GFCI, remove the cover from the AC and look for an issue or move the AC to a none GFCI protected circuit. Since you said it trips after the AC has run for 10 minutes, which is probably when the AC starts making water, I would suspect worn insulation on a wire in the AC that is exposed to the AC condensate. Hope this helps, Good Luck.
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