FOUND IT! So Dimmitt serviced it TWICE, before I went to GMC. Service ticket from 6/8/18 reads " UNABLE TO DETERMINE CAUSE OF LEAK AT THIS TIME, CK AC BLOWING WARMER THAN USUAL CK FREON LEVEL TO BE .5 KGS LOW PERFORM EVACAND CHARGE AND CK FOR LEAKOF 1234YF SYSTEM AND FINDINGS INCONCLUSIVE AT CHARGE AT THIS TIME UNABLE TO FIND LEAK CAUSE RECHARGE SYSTEM"
Then on 9/6/18, I went back to get washers fixed, still no parts, so I left and took it to GMC for washers. On 11/8/18, GMC fixed washers, AC was not noticeably warm, as Florida isn't that hot in November.
On 3/21/19, AC was warm so I took it to GMC dealer, who told me DIMMITT had "no record of servicing the AC". So either Dimmitt lied to GMC, or GMC never checked, anyway I look at it, someone is owing me my $1675.
Should I play nice with Dimmitt then crank it up a notch if needed? Or is GMC my first call, for failing to warranty Dimmitt's work?
GMC dealer seems to have their act together, so I'm thinking Dimmitt either lied or is just incompetant and didn't look into my service records when GMC dealer called them.
(sorry for the confusion on dates, at least now I have a clear picture of how it all went down)
Pic attached of Dimmitt AC service on 6/18/18
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