As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 5523 - STL - UPON GEAR RETRACTION, LANDING GEAR LEVER DISAGREE ON EICAS. MAINTENANCE REMOVED AND REPLACED BOTH LEFT/HAND MAIN GEAR UPLOCK PROX SWITCHES AND THE CONNECTOR TO THE UPPER UPLOCK PROX SWITCH. SWING GEAR, OPS CHECK GOOD.