What was found
EN ROUTE FROM SAN TO PHL, CREW REPORTED A FAINT BURNING OIL SCENT DETECTED AT TOP OF DESCENT. MX TROUBLESHOT IAW JOB CARDS 99L21005001, 26L00036003 & 99L25021002. NO ODOR DETECTED WHEN RAN. TEST SHOWS NO OIL CONTAMINANTS FOUND, NO HISTORY, ACFT OK FOR SERVICE.