As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW- FLT 1969 - ON TAKEOFF CABIN RATE OF CLIMB SHOWED DESCENT OF 600 FEET PER MINUTE FOR APPROXIMATELY TWO MINUTES, TRANSFER LOCKOUT ILLUMINATED. PUSHED RESET LOCKOUT AND LIGHT REMAINED ON. RETURNED AND LANDED DFW WITHOUT FURTHER INCIDENT. REPLACED STANDBY PRESSURE CONTROLLER AND PRESSURE TRANSFER RELAY R2-258. SYSTEM GROUND CHECKED, NORMAL OPERATION. (X)