Unserviceable seats (or overhead PSU) isn't such an unusual event. Here it's noted and briefed, a belt with the word "SEAT NOT IN USE" is placed across the armrests to physically stop people sitting on them and Ops will sort out the seat assignments so the outstation doesn't even need to know.
Last edited by flight_mode; 6th Aug 2019 at 18:00.
Reason: spelling