As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
#2 ENG OIL PRESSURE FLUCTUATED IN FLIGHT INTO CAUTION RANGE, AND INTO NORMAL RANGE. AFTER TROUBLESHOOTING, FOUND OIL TANK EMPTY. FOUND CLOGGED VENT LINE, WHICH ALLOWED OIL TO BE SIPHONED OUT DURING OPERATION. CLEANED P2 AIR LINE AND T FITTING. CLEANED BLEED VALVE FILTER. CLEANED AND INSPECTED ALL CHIP DETECTORS. FILLED OIL TANK TO PROPER LEVEL. PERFORMED OPS CHK FLIGHT AND FOUND SATISFACTORY.