What was found
CHAFING AT BODY STATION 900, LBL 57 ON THE LOWER WING SKIN PANEL (P/N: 111T4015-4) AND LOWER CENTER WING BEAM WEB (P/N: 111T5077-2), DOUBLER (P/N: 111T5012-21), & LOWER CHORD (P/N: 111T5012-17). THE SKIN PANEL, WEB, DOUBLER, AND CHORD WERE REPAIRED. THE AIRPLANE WAS GROUNDED.