What was found
INSPECTION OF OIL TEMPERATURE BYPASS VALVE REVEALED LOOSE NUT. REF: LYC SB 518C, 5-2-95. THIS SB LISTS P/N 53E19980, S/N 159, AND HIGHER AS N/A. SUBMITTER SUGGESTS SB BE REVISED TO INCLUDE ALL PART NUMBERED AND SERIAL NUMBERED VALVES UNTIL LATEST STYLE PART NUMBER IS INSTALLED. VALVE SENT TO LYC FACTORY FOR INSPECTION PER PART NUMBER AND SERIAL NUMBER.