What was found
BS 500G, LT FRAME IN FWD CARGO BAY, A .500 INCH HOLE HAS CRACK INDICATION NOTED IN FRAME AT 10 O'CLOCK POSITION. REF OPS 7318, FIG 11, CIRCLE NOTE 1, STR 20L-STR 21L. ACFT GROUNDED. REPAIR FUSELAGE FRAME AT BS 500G LT SIDE S-20L TO S-21L IAW SRM 53-00-07-2R-B.