As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB AND AND CRUISE, DEICE TIMER CAUTION ILLUMINATED AND WENT DARK MULTIPLE TIMES. DIVERTED AND ACCOMPLISHED A UNEVENTFUL LANDING. REMOVED FROM SERVICE. REPLACED TMU IAW Q400 AMM 30-11-01-000/400-801 FUNCTIONAL TEST GOOD. RETURNED TO SERVICE.