As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING BEFORE TAKEOFF CHECK, THE TRANSMISSION OIL PRESSURE LIGHT CAME ON, BUT THE GAUGE WAS READING AT A NORMAL LEVEL. LANDED AND CALLED MAINTENANCE, SHUTDOWN AND CHECK THE MEL BOOK AND THE CONNECTOR PLUGS. MAINTENANCE FLYING PART OUT. MAINTENANCE REMOVED TRANSMISSION PRESSURE SWITCH AND INSTALLED SERVICEABLE PRESSURE SWITCH IAW MM. (K)