As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TR1 TRANSFORMER EXHIBITS FRACTURE SOLDER JOINTS. MAXIMUM SOLDER CONNECTS IS 11. THIS CONDITION CAUSES AN INTERMITTENT FAILURE OF THE AIRCRAFT PRESSURIZATION SYSTEM. SPECIFICALLY, THIS CONDITION WILL CAUSE ONE OR BOTH OF THE ELECTRONIC ACTUATOR BOXES WHICH DRIVE THE OUTFLOW GATE TO SHUT DOWN.