As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING POST MAINTENANCE FUNCTIONAL CHECK, FOUND LH OIL PRESSURE INDICATOR LIGHT TO NOT ILLUMINATE DURING CHECK (PUSH TO TEST CHECK GOOD). MECHANICS FOLLOWING MAINTENANCE TECHNICAL DATA CHECKED BULBS, AND SD CARD PER INSTRUCTIONS. AFTER FURTHER TROUBLESHOOTING, FOUND THE TIME DELAY RELAY TO HAVE FAILED ON ONE CHANNEL.