As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STBY PITOT HEAT CAUTION LIGHT ILLUMINATED DURING CRUISE. WHILE COMPLETING THE CHECKLIST IT EXTINGUISHED AGAIN. REMOVED FROM SERVICE. INSPECTED JUMPER WIRE 3410-4252E-16-2 AT IRPS TIMER MONITOR AND FOUND SPLICE 3410-E1 VERY DARK AND SHOWING SIGNS OF HEAT DAMAGE, REPLACED SPLICE PER Q400 WM 20-16-05, NO OTHER DEFECTS NOTED, OP TEST OF STBY PITOT HEAT GOOD PER AMM 30-30-00-710-801. RETURNED TO SERVICE.