Today (8/25/25) the 2nd floor zone control board was replaced with a client supplied board. The new board is identical to the removed board. Voltage was checked on the board power side and the rooftop unit side. The system returned to operation after the replacement. The rooftop unit that is controlled with this board had it’s heat exchanger checked and it was in good condition. The indoor blower motor is operating within the proper amp range and the belt is also in good condition. The manual for this board was left next to the new zone board. Due to this being a client supplied part there will be a warranty on labor only for one year. Thank you, Jon Tech notes: Zoned board replacement//Gen V vs. 4.01/302307 Rev D Hx good Indoor blower 6.2a