As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(PIREP) NR 1 ENGINE OIL PRESSURE WARNING LIGHT ILLUMINATED DURING CLIMBOUT. GAUGE INDICATED LESS THAN 20 PSI WHILE IN FLIGHT. AFTER ABOUT 1 MINUTE, GAUGE STARTED FLUCTUATING RAPIDLY. AFTER ADDITIONAL 1 MINUTE, GAUGE READINGS RETURNED TO NORMAL.MECHANIC FOUND NR 1 ENGINE OIL SYSTEM LOW. SERVICED NR 1 ENGINE OIL SYSTEM IAW MM 12-28-79 PG. 3, NR 2.