What was found
AIRCRAFT IN BASE MAINTENANCE: CORROSION ON UPPER SPLICE INBD SIDE ON LOWER SILL AT LEVEL OF FR66 STRG 23L. MEASURES OF CORROSION: L= 0.950 IN, W= 0.550 IN, D= 0.025 IN. MAINTENANCE REPLACED UPPER SPLICE, INBOARD POSITION LOCATED ON LOWER SILL ON FR 66 AT LEVEL OF STRG 23L IAW SRM 51-42-11-801, SRM 51-72-11-911-001, AND DRAWING E53474250.