As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 7978 RIC LANDING GEAR AIR/GND DISAGREE MESSAGE ON THE EICAS AND THE GEAR WOULD NOT RETRACT. MX INSPECTED AND FOUND THAT THE NLG WOW PROXIMITY SENSOR CONNECTOR WAS LOOSE AND THAT THE RH MLG AIR/GND PROXIMITY SWITCH WAS OUT OF ADJUSTMENT. CORRECTIONS WERE MADE AND THE SYSTEM CHECKED GOOD AS PER AMM PROCEDURES.