As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LANDING AIR GROUND FAIL MESSAGE ON TAKEOFF. GEAR DID NOT RETRACT. HOOKED UP PROX SWITCH BREAK OUT BOX AND PERFORMED GEAR SWINGS. FLAGGED DOWNLOCK A RIGHT AND B LH PROX SWITCHES. SLAVED IN BOTH A-RIGHT AND B-LEFT PROX SWITCHES. NLG TORQUE LINKS CENTER BOLT DOES NOT ROTATE BY HAND. REMOVED AND REPLACED NLG TORQUE LINK ASSEMBLY. OPS CHECK SAT.