As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THIS MAIN GEAR BOX OIL PRESSURE SWITCH WAS CAUSING MGB PRESSURE LIGHT TO ILLUMINATE ON CAUTION PANEL. FURTHER RESEARCH INTO THIS PARTICULAR PART SHOWED INTERNAL WIRES CHAFFED AGAIN HOUSING CAUSING A SHORT IN WIRES AND ILLUMINATING MGB PRESSURE LIGHT. SUGGEST INTERNAL WIRES BE WRAPPED AN PROTECTED WITH WIRE LOOM DURING MANUFACTURING BEFORE HOUSING IS PLANED INTO SWITCH.