What was found
WHILE ACFT IN HEAVY CHECK FOUND CORROSION AT RH OB GUSSET AT FR90, REMOVED AND REPLACED RH OB GUSSET AT FR 90 REF. E175 SRM 51-40-08, 51-23-01. RESTORED SURFACE PROTECTION REF SRM 51-23-06. ACFT REMAINS IN HEAVY CHECK UNTIL COMPLETION.