What was found
DURING HEAVY MAINTENANCE: CORROSION ON EXTERNAL FUSELAGE SKIN BTTW FR 74/75 AND STRG 29LH / RH; REF: TECHOPSMX WO# 1974 NR# 00058 CORROSION ON EXT. SKIN OF FUSELAGE BTW FR74/75 AND STRG 29LH/RH WAS REMOVED AND EVAL: ORIGINAL THICKNESS 0.100" AND REMAINING MIN. .090" AND 0.091" WITHIN LIMITS PER EMB190 SRM 51-12-01 PAR 6 SRM 51-10-03 PAR 4D AND & SRM 53-23-01 AD 51 PAR 4 TABLE 102 QC 20002656 & TECH 201959846.