Our coach is a 2004 Beaver Marquis Sapphire with HWH air leveling. Its air leveling has been repaired twice in the past five or six years. Both times, the circuit boards out of its control box (found on the ceiling of the electrical bay behind the foremost basement door, streetside) were sent to HWH for repair. The most recent repair was in May/June 2019. Bob's Diesel, located in Yuma, AZ, was our local repair firm for this job. The Bob's Diesel technician determined the circuit boards in the control box were the problem. After his diagnosis, the tech removed the boards, sent them to HWH, and after about two months, HWH returned them after having replaced a couple of ICs and a couple of other parts. When the circuit boards were reinstalled, the air leveling worked like new again. Recall, this time period was in the first several months of the Chinese Virus pandemic. HWH was operating with a skeleton crew making turn-around time for repairs quite lengthy.
If memory serves, HWH parts labeled "P..." are original to the coach's manufacture date, while parts labeled "AP..." are subsequent replacement parts. Thus, my opinion would be your parts labeled "AP..." are likely repair parts.
Our coach may have an HWH reset button somewhere but there is not an HWH reset button located near the generator slide button in our electrical bay. Its reset button may be located in the HWH control box with the circuit boards... I don't know.