As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED STRONG BURNING SMELL IN COCKPIT. NOTICED PROP DE-ICE GAUGE WAS ON BUT THE SWITCH WAS OFF. CYCLED SWITCH BREAKER. DE-ICE GAUGE TURNED OFF, BUT SWITCH REMAINED LOOSE. THEY PULLED C/B'S AS PRECAUTION. MAINTENANCE TROUBLESHOT TO BAD SWITCH. BYPASSED SWITCH AND PROP DEICE SYSTEM OPS CHECKS GOOD WITH NO SHORTS. THE SWITCH WAS REPLACED WITH NO FURTHER DEFECTS NOTED.