What was found
ENGINE 1 LOW OIL PRESSURE IN DESCENT, SHUTDOWN ENG 1 IAW QRH UPON LANDING ENG EXCEEDANCE OIL QTY DROPPED IN FLIGHT. (FLT 4117). INTERROGATED CMC & FOUND ENG EXCEEDANCE OF 21PSI FOR 828 SECS PERFORMED TROUBLESHOOTING IAW LMM 72-00-00-810-020. SERVICED 1 ENG WITH 9QTS OF OIL COMPLIED WITH LMM 77-00-00 SPECIAL PROCEDURES 015 & 79-00-00, SPECIAL PROCEDURES 003, NO METAL DEBRIS NOTED IN THE FILTER OR CHIP SYS. PERFORMED DRY RUN OF ENG 1 & FOUND OIL LEAK FROM LOOSE B-NUT ON SUMP OIL SUPPLY LINE LEADING INTO FUEL/OIL HEAT EXCHANGER. TIGHTENED LOOSE LINE, CLEANED ENGINE OF OIL, & PERFORMED TWO EXTENDED ENGINE RUNS TO CHK FOR ADDITIONAL LEAKS, NONE NOTED 1 ENG OIL PRESSURE & LEVEL REMAINED NOMINAL MCI CREATED FOR DAILY INSP OF ECD FOR METAL DEBRIS FOR 50 FLT CYCLES IAW LMM 72-00-00-280-013, ENG OPS WITH INADEQUATE OIL SUPPLY.