What was found
MAJOR: WHILE AIRCRAFT WAS IN FOR HEAVY CHECK, EXTERNAL DOUBLER LOCATED AT FR 18 STGR 27R AND 28R REQUIRES REMOVAL AND EVALUATION. REMOVED EXISTING EXTERNAL DOUBLER/FILLER LOCATION FR 18 STGR 27R-28R, PER EMB175 SRM 51-40-08. INSTALLED NEW REPAIR DOUBLER AND FILLER, PER E175 SRM 53-10-01/REPAIR 12P. AIRCRAFT IS STILL OUT OF SERVICE FOR HEAVY CHECK COMPLETION.