What was found
ETOPS - DMI# 206657 ENG 1 FIRE LOOP B FAULT IN CRUISE ( ENGINE FIRE DETECTION SYSTEMS LOOP B (EXCEPT FOR ER OPERATIONS BEYOND 120 MINUTES, ONE MAY BE PROVIDED: ASSOCIATED LOOP A IS OPERATIVE / THE ENGINE FIRE TEST IS PERFORMED BEFORE EACH DEPARTURE) ) TROUBLESHOT PER TSM 26-12-00-810-804-A. FOUND PYLON LP "B" DETECTOR (4WD1) INTERNAL SHORTING TO GROUND. NEED TO REPLACE #1 ENGINE PYLON DETECTOR LP "B". REMOVED AND REPLACED, #1 ENGINE PYLON DETECTOR LOOP "B", PER AMM 26-12-16. OPS CHECK GOOD. MIC SHEET CLEARED, PLACARD REMOVED.