As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF CLIMB, CREW REPORTED RECEIVING A LANDING GEAR AIR/GROUND FAILURE MESSAGE ON THE EICAS AFTER SELECTING GEAR UP. MAINTENANCE ADJUSTED BOTH LEFT MLG PROXIMITY WOW SWITCHES IAW AMM PROCEDURES. SUBSEQUENT GEAR EXTENSION AND RETRACTION OPERATIONAL CHECK WAS GOOD.