What was found
DURING FLIGHT, DESCENDING THROUGH 18,000 FT, THE LT ENGINE LOST OIL PRESSURE. CREW SHUTDOWN ENGINE AND DIVERTED. THE ACFT LANDED SAFETLY WITHOUT FURTHER EVENT. ENGINE WAS INSPECTED. THE ENGINE LOST OIL FROM A BAD O-RING ON THE OIL FILLER CAP. THEY RESEALED THE OIL FILLER ROD CAP GAUGE, FLUSHED OIL SYS, SERVICED WITH OIL, PERFORMED SOAP SAMPLE AND PERFORMED CARBON SEAL HEALTH CHECK. ACFT WAS RETURNED TO SERVICE.