What was found
DURING HEAVY MAINTENANCE: AFTER TCAS BOTTOM ANTENNA REMOVAL, FOUND CORROSION IN FUSELAGE SKIN LOCATED BETWEEN STRG 27L/28L FR 16/17 AT FWD FUSELAGE LOWER LOBE; WAS REPAIRED PER ETI-190-23-566 REV.ORIGINAL, ETD2023-190-014381 AND NO.E23-447-01 REF TOMX NRC 00158 WO 2258.