As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHX-ABQ - FLT NR 200 - NR 1 PACK TRIP RESET TWICE. AIRCRAFT RETURNED TO PHX WITH ALL TEMPS AND PRESSURE NORMAL, LANDING WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED NR 1 PRIMARY HEAT EXCHANGER AND NR 1 PACK FLOW CONTROL VALVE DUE TO LOW FLOW. LT PACK SYSTEM OPS AND LEAK CHECK GOOD. AIRCRAFT RETURNED TO SERVICE. REFERENCE AWXA9500244.