As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER GEAR RETRACTION LANDING GEAR MONITOR EICAS MSG APPEARED. FOUND PROXIMITY SENSOR RT MLG INBOARD WIRING DOWN AND LOCK SENSOR HAD A CHAFED WIRE. REPAIRED WIRING PER MM CHAPTER 20 BITE OF THE PSEU, OPS CHECK GOOD RT MLG DOWNLOCK SENSOR.