As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACFT HAD TO MAKE AN UNSCHEDULED LANDING DUE TO A ENGINE RGB CHIP LIGHT THAT ILLUMINATED DURING FLIGHT, THE MECHANIC CLEANED OIL OUT OF THE RGB CHIP DETECTOR CONNECTOR PLUG THE OPS CHECK WAS GOOD AND THERE HAS BEEN NO FURTHER CHIP LIGHTS SINCE THE CONNECTOR PLUG WAS CLEANED.