As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL270 AND .84 MACK, THE RED AND GREEN RIGHT GEAR LIGHTS ILLUMINATED. THE LANDING GEAR HANDLE WAS PLACED UP. ALSO THE LEFT GREEN GEAR LIGHT WOULD NOT TEST INFLIGHT. PER FLIGHT CREW DEBRIEF: WHEN GEAR HANDLE WAS MOVED FROM "OFF" TO "UP" THERE WAS NO CHANGE. ALL INDICATION RETURNED TO NORMAL WITH GEAR EXTENSION AND LANDING WAS UNEVENTFUL. R&R'D UPLOCK PROX SENSOR PER MM 32-61-081-4. OPS NORMAL.