I'm having a problem with a TAC32 duplex 4-stop hydro installed in 2014. With no demand, the cars will go to the 3rd floor and cycle their doors and chime the up or down car lantern. I'm getting a stuck 3rd floor up hall button fault. Both cars will sit at the 3rd floor and every 30 seconds both cars will cycle the doors simultaneously, car 1 will chime its up lantern and car 2 will chime its down lantern. The 3rd floor hall button board doesn't have its green power LED lit. I verified the 3rd floor board and both buttons work by plugging them in on the 2nd floor. I think I have a bad hall button board to hall node board cable or a bad 3rd floor hall node board. If it is the hall node board do I just power down both cars and pull the old board out and match the jumper configuration on the new board and then power back up?