What was found
WHILE ACCOMPLISHING T/C 78273000, FAULT CODE APPEARED ON NR 1 ENGINE 77-20871, THE TOP LT EGT SIGNAL, T495S4, IS OUT OF RANGE, ECONOMIC FAULT. MUST BE CORRECTED IN 50 HOURS. GROUNDED. ACCOMPLISHED ENGINE 1 ELECTRONIC ENGINE CONTROL MONITORING OF T49.5 INPUTS. S1 = 57.87, S2 = 45.49, S3 = 52.44 AND S4. CONFIRMS FAULT. ACCESSED NR 1 ENGINE, DISCONNECTED ALL EGT HARNESS CONNECTORS. PERFORMED CLEANING OF EGT HARNESS CONNECTIONS. REINSTALLED AND SAFETIED ALL EGT CONNECTIONS. REACCOMPLISHED ELECTRONIC ENGINE CONTROL INPUT MONITORING T49.5. S1=24.51, S2=11.89, S3=13.84 AND S4 = 29.04. FAULT NO LONGER PRESENT.