What was found
NR 1 IDG FAILURE & APU AUTO SHUTDOWN, RTFL. NR 1 ENG IDG LO OIL PRESS DISPLAYED, IDG DISCONNECTED. APU GEN POWERING NORMALLY. REPLACED IDG ON NR 1 ENG AND REPLACED APU LOW OIL PRESS SWITCH. AFTER IDG CHANGE, RAN ENGINE AND HAD 0 FREQ AND 0 VOLTS. SWAPPED GCU, RAN ENGINE AGAIN AND STILL NO HELP. REPLACED OVERHEAD CONTROL SWITCH -NO HELP. REPLACED EGIU (P/N 746923E - S/N 2117) PER FOREMAN REQUEST - NO HELP. FOUND NR 1 ENGINE IDG HARNESS NOT FULLY SECURE. REROUTED & SECURED HARNESS. IDG OPS CHECKED GOOD.