I would recommend you call in for service.
In wash count 4861, you had a code 8112 that happened first and this indicates one of the arm rotate proximity switches is "OFF" for 3 seconds. The code A129 indicates the state of the proxes that are on. "A" indicates the machine is not at home. The first "1" indicates the arm tilt prox is on. The next "1" indicates the right trolley prox is on. The 2 indicates the arm to rear prox is on. You are missing one of the rotate proxes, but it depends on where the arm is located and which direction it should be spraying at that point to determine which one is missing. The code 8708 indicates the rear ultrasonic isn't detecting the floor (which indicates that the machine likely is still positioned above the car).
I'd look at your rotate proxes. There should be 2 that would be on at any given time. PLC input X40 is for left rear. X41 is right rear. X42 is right front and X43 is left front.
X41 was on when it shut down, so if it were aimed at the rear (and behind the vehicle), X40 was missing. If the arm were on the right side and aimed at the passenger side, you are missing X42. Look at both of those inputs on the PLC while you rotate the arm manually, and you can see which ones go on or off. I'd move the machine back towards the entrance in the approx position it would have been while washing to see if one is missing. That could indicate a boom wire going bad, or possibly a prox.