What was found
ON CLIMB-OUT FROM PHL, NR 1 ENGINE STRUT OVERHEAT LIGHT BEGAN FLICKERING. LIGHT BECAME STEADY UPON LEVEL OFF AT FL 280. ACCOMPLISHED ENGINE STRUT OVERHEAT QF CHECKLIST. LIGHT WENT OUT WHEN NR 1 THROTTLE RETARDED TO NEAR IDLE. AFTER ABOUT 5 MINS, LIGHT RE-ILLUMINATED. ACCOMPLISHED REMAINDER OF CHECKLIST AND SHUTDOWN NR 1 ENGINE IAW CHECKLIST. FOUND WATER IN PLUG, CLEANED. PUT PLUG IN AFT STAIRWELL BACK TOGETHER PER M/M 20-11-13, SEALED PLUG, NO LEAKS NOTED ON ENGINE RUN-UP, NO FLICKERING OF OVERHEAT LIGHT FOR NR 1 ENGINE. OK FOR SERVICE.