What was found
NO 1 ENGINE FIRE TEST DOES NOT ILLUMINATE LIGHT ON A LOOP. GROUNDED - YES. VERIFIED DISCREP. M279 MODULE SHOWS RIGHT CORE FAULT. REF. B737-800 MM 26-10-01, AND B737-800 WDM 26-11-11 PG 1 SHT 1, REMOVED M279 MODULE, AND LOOP A PIN 25 TO GND READS 1.318K OHMS. SHOULD BE 871 OHMS. WITH METER STILL CONNECTED SHOOK DOWN ENTIRE ENG. 1 A LOOP HARNESS AND FOUND ERRATIC RESISTANCE READINGS. SUSPECT BROKEN INTERNAL CENTER WIRE INSIDE INSULATION IN SAME AREA. REF. MM 26-11-02, REMOVED/REPLACED MW0325 CORE HARNESS AGAIN. OPS CHK NML REF. SAME. ENG 1 FIRE DET. OPS NML REF. MM 26-11-00 NUMEROUS TIMES.