As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMF - RIGHT ENGINE PROPELLER 'NP' INDICATION REPORTED ERRATIC DURING CLIMB-OUT. ALL OTHER ENGINE INDICATIONS NORMAL. AIRCRAFT RETURNED TO STATION WITHOUT INCIDENT. MAINTENANCE CLEANED AND INSPECTED RIGHT PROPELLER 'NP' INDICATOR CANNON AND SWAPPED GAUGES FROM RIGHT TO LEFT POSITION. PROPELLER INDICATIONS REPORTED NORMAL DURING ENGINE GROUND RUN. AIRCRAFT RETURNED TO SERVICE.