Need Help Diagnosing PS3 Controller Ghost Inputs (MCU V3.5x 1.12)

Hello, I’m struggling with ghost inputs on a DualShock 3 (MCU V3.5x 1.12) with a Toshiba T6UN6EFG-002 Japan 0833EGIF0461ZAO. I’ve tried cleaning and reassembling, but the issue persists. Any advice would be appreciated!

Problem:

• Ghost Inputs: Pressing one button triggers multiple inputs (e.g., Square causes random b, w, [, ], a, 1 combinations.). [ for context: the reWASD mapping is in the photos link ]
• Pattern: After connecting via USB, the controller outputs [[[]]]]] after ~15 seconds.
• Multimeter Fix: Dragging the red(signal) probe across all pins temporarily stops the issue.

What I’ve Tried:

1. Disassembled, cleaned PCB
2. Tested button continuity with a multimeter (Square=TP30, X=TP31, TPs to Toshiba pins, connectors up to the white boarder).
3. Confirmed the issue occurs wirelessly and via USB

Limitations:

• No soldering tools yet.
• Can’t identify shorts or damaged resistors.

I removed everything and left the PCB only to be sure that the problem isn't from anywhere else. I bridged the pins with the help of wires, paper clip and other metal conductive object.

Any tips what to look for? What else can i try? Any ideas where the problem could be?

Link to photos: https://mega.nz/folder/oigjFaiI#7NXMg2_7...