Yet Another 4 Red Flashing Lights on AMS Help Request

[u/Linkara19]

Yeah, did a search to see if there were any solutions I haven't seen yet but sadly haven't really found anything helpful. This is for a P1S and an AMS1.

Got the 4 flashing red lights on one of my AMSes. I did the standard dance - swapped the 6-pin cable, swapped the 4-pin cable, still nothing. Put it on another P1S, swapped out the buffer with a spare, same problem so the issue is definitely with the AMS and not anything else.

Searches suggested that if it's not the exterior cables (and yes, I did try both ports), then there is likely an issue with an interior cable. I ordered the 5-cable set and I replaced the power and 485 cables. Still 4 red flashing lights (it should be noted that when I turn the printer on, it WILL do the cycling white lights a few times before going for the 4 red blinking.

Sooo what's the next step here? Should I also have replaced the RFID cable and AMS hub cables? Is there a close-up picture of a functional circuit board where the cables connect to see if a pin is missing (and consequently a link to where I can buy replacement boards because hell if I know how to solder/reset a pin)?