GMC Suburban with CEL code P0430 and slight rough idle after a/c charge ??

downloaded test results from scan tool. here's the file:
recently, had a/c serviced. when picked it up, it had this code (didnt have
it before took in.)
the a/c shop siad that6 compressor wasnt running because a/c/ system empty. so, they injected dye, leak tested it with a light , found no leaks, and recharged the system. when i picked up the truck (via lockout and 2nd key), truck had CEL.
P0430 , and the test results in the file.
i dont know what recharging the a/c would have to do with inefficiency in the 2nd bank, but maybe just a coincidence??
what to check ?
best regards stu
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