What was found
LEFT UPPER FUSELAGE SKIN CRACKED JUST AFT OF FRAME 75 & ABOVE STRINGER 2L. CRACK IS APPROX 3/8" LONG. EASI 8071 USED, FREQ=400 KHZ, LPF=100, V-GAIN=75, H-GAIN=64, 100-500KHZ PROBE USED. REPAIRED CRACKED LT FUSELAGE SKIN AT FRAME 75 & STRINGER 2L IAW ERS-EM-53MR-1235.