As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ON DESCENT INTO YUL CREW SELECTED FLAPS 1. FLAPS DEPLOYED BUT THE SLATS FAILED TO DEPLOY. CAPTAIN DECLARED A PAN PAN AND THE LANDING WAS CARRIED OUT WITHOUT FURTHER INCIDENT. CAPTAIN WILL FILE AN ASR. RESOLUTION FOUND R/H TRACK 5 (6077CM) ACTUATOR TRIPPED. REPLACED ACTUATOR IAW AMM 27-84-49. SYSTEM OPS CHECK C/O SERV.