As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TROUBLESHOOTING THE GEAR EXTENSION SYSTEM, AN ERROR WAS FOUND IN THE WIRING DIAGRAM ON PAGE 10-2 OF MITSUBISHI MM, YET 69016. WIRE LABELED 'G125D20' ON NR 10 PIN OF TB 302 IS ACTUALLY WIRE 'G174AS0'. THIS ERROR WAS FOUND BY LOOKING AT THE ACTUAL WIRE NUMBER ON THE AIRPLANE. SUBMITTER SUGGESTS CORRECTING THIS WIRNG DIAGRAM APPROPRIATELY WITH MITSUBISH AND BEECH.