As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OIL PRESSURE RED LIGHT ILLUMINATES AND ORAL WARNING OIL PRESSURE GAUGE FLUCTUATED BETWEEN 45-55. RETURNED TO LAX. REMOVED AND REPLACED LEFT ENGINE OIL PRESSURE SWITCH WITH SERVICEABLE SWITCH. PERFORMED ENGINE RUN OIL PRESSURE INDICATION WAS NORMAL WITH NO FLUCTUATION. OPS CHECKS GOOD. S/N ON: 535, S/N OFF: 0669.