As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON GEAR RETRACTION ON T/O RIGHT MAIN GEAR UNSAFE (RED LIGHT). SECONDARY INDICATION ON SYNOPTIC DISPLAY ALSO UNSAFE (RED). PER QRH PROCEDURES, CYCLED THE GEAR. GOOD UP AND LOCKED INDICATION (NO LIGHT) ON PRIMARY GEAR INDICATOR. SYNOPTIC INITIALLY SHOWED NO LIGHT BUT MOMENTS LATER RIGHT MAIN "RED" LIGHT AGAIN ON SECONDARY DISPLAY. FOUND RT MLG UP LOCK PROX SENSOR OUT OF ADJUSTMENT. PERFORMED RIG OF RT MLG UP LOCK PROX SENSOR IAW AMM 32-61-15-5. OPS CHECK GOOD. AC RELEASED FOR SERVICE.