As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOW MGB OIL PRESSURE WARNING LIGHT FLICKERED IN FLIGHT WITH NO AUDIBLE WARNING. SWITCH WAS REPLACED WITH A SERVICEABLE PAR AND WITH NO FURTHER DISCREPANCY NOTED. THIS IS TO AN UNCOMMON FAULT FOR THIS PART. SUGGEST IMPROVED DESIGN OR BETTER QC FOR INTERNAL PARTS AS PERHAPS ONLY A THIRD OF THESE SWITCHES FAIL IN SERVICE. (K)