As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, UNABLE TO MAINTAIN CABIN PRESSURE, INITIATED EMERGENCY DESCENT. REGAINED CONTROL AT FL 180 IN MANUAL MODE. FOUND INTERMITTENT WIRES AT RIGHT PACK FLOW CONTROL AND SHUT OFF VALVE. REPLACED 3 WIRES AT CANNON PLUG D870, WDM 21-61-02 PG.4. OPERATION NORMAL.