What was found
FLT 690 ORD-SRQ. ON APPROACH, THE FLAPS JAMMED AT ZERO, AND THE SLATS EXTENDED NORMALLY. CREW PERFORMED A GO-AROUND, AND DECIDED TO DIVERT TO PIE AND NOTIFIED ATC & DECLARED AN EMERGENCY AS A PRECAUTION. THE APPROACH WAS COMMENCED, AND THE AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE C/W TSM 27-51-00-810-810 RESET BOTH SFCC'S AND NO FAULTS NOTED. FLAP OP'S CHECKED OK, WITH NO DEFECTS NOTED. FURTHER TROUBLESHOOTING FOUND LEFT FLAP DRIVE SYSTEM NEEDED RIGGING & MAINT. C/W ADJUSTMENT OF LEFT FLAP DRIVE TORQUE TUBES & ADJUSTED RIGHT APPU 30CV TO NULL POSITION PER AMM 27-54-00. ALSO FOUND FLAP TRACK NR 1 ACTUATOR HAD TORQUE LIMITER TRIPPED. REMOVED AND REPLACED NR 1 FLAP TRACK ACTUATOR 6205CM PER AMM 27-54-49PB401 & OP'S CHECKED OK.