What was found
DURING FLIGHT THE CREW RT ENGINE OIL PRESSURE DROPPED TO 30PSI WITH THE ASSOCIATED OIL PRESSURE WARNING ON THE CWP. CREW FOLLOWED THE QRH AND DIVERTED TO SCE. AFTER LANDING CREW CHECKED RH ENGINE OIL LEVEL. SIGHT GLASS SHOWED BELOW NORMAL. CREW NOTICED NO VISIBLE LEAKS. A/C TAKEN OUT OF SERVICE 4-18-04 AT 1915(LT) PIT MX SENT TO SCE TO ACCOMPLISH A C-SUMP. OPERATIONAL TEST AND LEAK CHECK GOOD. A/C RETURNED TO SERVICE 4-19-04 AT 1515(LT)