What was found
APU BAY, INTERNAL STRUCTURE RT SIDE, BTWN BS 1885.2 & 1918.9, ALUMINUM HONEYCOMB SKIN HAD CORROSION. TRIMMED OUT LOWER FWD SECTION OF HONEYCOMB ONLY ON SKIN BOND ASSY. PANEL TO REMOVE EXFOLIATED CORROSION, ACCOMPLISHED AND INSPECTION OF THE STRINGER AND SURROUNDING STRUCTURE IAW EA 757-5380-27-A4273, REV-, STEP 1. TRIMMED DAMAGED OUTER SKIN ON BOND ASSY PANEL TO REMOVE REMAINING EXFOLIATION PER E.A# 757-5380-27-A4273 STEP 1. ENLARGE CUTOUT BY 0.040". PERFORMED HFEC INSPECTION OF ALL 40 ACCESSED FASTENER HOLES, LOCATION COMMON TO THE DAMAGE AREA ON THE SKIN LAYER AND TITANIUM LAYER ONLY IAW EA 757-5380-27-A4273, STEP 5, PRELIMINARY 1. NO CRACK INDICATION NOTED AT THIS TIME.