What was found
LEFT UPPER FUSELAGE SKIN CRACKED AT 1ST FASTENER BELOW STRINGER 2L ON FRAME 75, APPROX 3/8" LONG. EASI 8071 USED, 100-500 KHZ PROBE, FREQ=400, V-GAIN=78.5, H-GAIN= 65.0, LPF=100. REPAIRED LT UPPER FUSELAGE SKIN AT FIRST FASTENER BELOW STRINGER 2L ON FRAME 75 IAW ERS-EM-53MR-1689. SEE WIPS & TASKS FOR DETAILS OF WORK PERFORMED.