As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE ATTITUDE PILOT HEARD AN ELEC CLICK AT THE SAME TIME NOTICED AN OZONE & HOT ELECTRONICS SMELL. THE PILOT NOTICED THE RT OIL PRESS GAUGE CB & THE RT OIL PRESS WARNING CB HAD POPPED. RETURNED & LANDED WITHOUT FURTHER INCIDENT. TROUBLESHOOTING REVEALED FAULTY RT OIL PRESS INDICATOR & BROKEN CONNECTOR ON RT OIL PRESS INDICATOR. BOTH COMPONENTS WERE REPLACED, OPERATIONAL CHECKS OF SYS WERE NORMAL.