What was found
DURING HEAVY MAINTENANCE, CORROSION WAS DISCOVERED ON CENTER FUSELAGE III FLOOR STRUCTURE, BTWN FR 87-88 AND AT RBL11. CORROSION FOUND ON TRACK BEAM; TRACK BEAM REPAIRED IAW SRM 53-23-10 REP 51 FIG 203 ALL WORK ACCOMPLISHED ON (YRQ) 4000019-2000-0120.