As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT LOST PRESSURE AT FL 250, AIR TURNBACK TO IND. REMOVED AND REPLACED 13TH STAGE MOD VALVE PER M/M 36-12, NO HELP ITEM REMAINS OPEN. FERRIED AIRCRAFT FOR MAINT. FOUND DAMAGED WIRE SPLICE IN E-4 POWER SHEILD. REPAIRED PER M/M 21, OPS CHECK NORMAL.