What was found
DFW - FLT 3620 - UPON ARRIVAL TO DFW, CREW SMELLED SMOKE AND CALLED FOR CFR. PAX AND CREW DEPLANED RAPIDLY. NO EMERGENCY EVACUATION ON THE TAXIWAY. NO FIRE DETECTED. CREW THEN BROUGHT A/C BACK TO GATE. NO FURTHER INCIDENTS REPORTED. A/C RETURNED TO SERVICE. CREW REPORTED SMOKE IN COCKPIT FROM ACM. NR 1 PAC VALVE CIRCUIT BREAKER POPPED JUST PRIOR TO SMOKE. MAINTENANCE R/I'D THE NR 1 PAC VALVE PER ATR72 JIC'S. PERFORMED OPERATIONAL CHECK SATISFACTORILY AND RETURNED A/C TO SERVICE. (M)