As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LT T/R RED CAS ILLUMINATED ON TAKEOFF ROLL (INDICATES T/R UNLOCK), ON TAXI BACK CAS TURNED YELLOW. MX CHECKED SWITCHES, FOUND S4 TO BE INTERMITTENT. CLEANED SWITCH ACTUATOR, PERFORMED OPERATIONAL CHECK OF SYSTEM , NO FURTHER DEFECTS NOTED.