As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING APPROACH INTO SAT AT 8000FT IN LEVEL FLIGHT WE RECEIVED A AP HOLDING RWD ANNUNCIATOR. A/P WAS DISCONNECTED AND AIRCRAFT HAD AN COMMANDED ROLL TOT HE LEFT. SECOND ATTEMPT TO ENGAGE A/P AP HOLDING RWD ANNUNCIATOR CAME ON. DISCONNECTED A/P AND AIRCRAFT AGAIN HAD AN COMMANDED ROLL TO THE LEFT. MAINTENANCE REPLACED THE AILERON SERVO. A SUCCESSFUL OPERATIONAL CHECK FLIGHT WAS PERFORMED. AIRCRAFT WAS RETURNED TO SERVICE.