As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, TCS BUTTON SEEMED TO STICK AND WE LOST FLIGHT DIRECTOR AND AFSC FUNCTIONS, DIVERTED. REMOVED FROM SERVICE. REMOVED AND REPLACED CAPT TCS SWITCH, IAW Q400 AMM 22-11-51-000-801/400-801. OPS CK GOOD, IAW Q400 AMM 22-11-51-710-801. A/C OK FOR RETURN TO SERVICE. AIRCRAFT RETURNED TO SERVICE.