As much as I agree that it sounds like a travel cable, I don’t see that P24M going through the traveler at all. Have you tried running with the buzzer unplugged, con 605? That’s just a guess based on what you said about it blowing at floor level. From a quick survey of the CWIL I had in the van, this is what I see on that circuit:

Con 650 - bottom left used for on board I/O, never seen it used.
Con 654 - car light/fan relay
Con 605 - buzzer
Con 300 - car top inspection switch
Con 303 - HW access switch
Con 210A - front door operator
Con 220A - rear door operator
Cons 652 & 653 - SPI loop to S24 cards
Cons 606 & 656 - front lanterns
Cons 607 & 657 - rear lanterns
Con 651 - position indicator
Con 706 - selector