Shortly after reading
@norm 's original post, I also discovered the AC wasn't working in my 2013 S85. Service Center replaced the DC-DC converter, explaining that the AC-specific fuse blew and fuses in the DC-DC converter are not replaceable. Strange that several of us have seen this same failure almost simultaneously. Repair invoice states fuse blew due to "moisture exposure," but I wonder if there was something in the software code that triggered a borderline high-current event to cause a small(?) percentage of us to experience the DC-DC fuse issue..??..
If root cause really was moisture incursion, anyone have any ideas how this might happen (path of moisture)?