As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX- ON FLIGHT 2355 WHILE CLIMBING EN ROUTE AND OUTSIDE AIR TEMPERATURE AT -4 DEGREES CELCIUS, PROPELLER DE-ICE CAUTION LIGHT ILLUMINATED. RAN EMERGENCY CHECKLIST AND AFTER CYCLING THE SELECTOR SWITCH ONCE PER THE CHECKLIST THE LIGHT WENT OUT, BUT THE SYSTEM NEVER WORKED AGAIN. RECALIBRATED TMCU IAW TASK 30-61-06-820-801. NO PARTS REPLACED. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.