As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING LANDING CREW FELT VIBRATION & ON SHORT FINAL MASTER CAUTION LIGHT ILLUMINATED WITH CORRESPONDING INTERMEDIATE GEARBOX CHIP DETECTOR LIGHT. REMOVED INTERMEDIATE GEARBOX PN S6135-66300-002, SN A15-887 & INSTALLED PN S6135-66300-2, SN A15-1045 IAW S-61 MM SA 4045-80 REV 47 CH 65-22-0. 12/12/13.