What was found
MSP - FLT 421 - CREW NOTED THE LEFT OIL PRESSURE WARNING LIGHT STAYED ILLUMINATED AFTER START-UP. MAINTENANCE REPLACED THE OIL PRESSURE WARNING SWITCH AND OPERATIONAL CHECK WAS SATISFACTORY. AIRCRAFT WAS RETURNED TO SERVICE. (X)
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
MSP - FLT 421 - CREW NOTED THE LEFT OIL PRESSURE WARNING LIGHT STAYED ILLUMINATED AFTER START-UP. MAINTENANCE REPLACED THE OIL PRESSURE WARNING SWITCH AND OPERATIONAL CHECK WAS SATISFACTORY. AIRCRAFT WAS RETURNED TO SERVICE. (X)