As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - AFTER TAKEOFF MASTER CAUTION LIGHT ILLUMINATED. PRESSURE FLOW FOR BOTH PACKS INDICATED ZERO POUNDS PER SQUARE INCH (PSI) AND BOTH PRESSURE LIGHTS ON THE CONTROLLER WERE ILLUMINATED. COULD NOT REINSTATE PACKS. RETURNED TO ELP AND LANDED WITHOUT INCIDENT. REPLACED PRESSURE SWITCHES FOR BOTH PACKS. SYSTEM GROUND CHECKED NORMAL OPERATION.