Final (hopefully) update. I got my car back on 9/5 (took it in on 8/4 so just over 30 days). Service paperwork lists the following:
"Performed short test and found dtc's in PTCU codes U016883 and U019B83, SG-LG codes U1906F1 The control unit 'On-board charger' has an internal fault, U1907F1...