As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RT PACK OFF LIGHT NO INDICATION, WITH RIGHT PACK TURNED OFF NO EICAS "RT PACK OFF" SHOWS ON LIST. FOUND RT PACK FLOW CONTROL VALVE WILL NOT GO FULL CLOSED POSITION. TRANSFER TO DMI NR 138320, IAW DDG 21-51-02 CAT "C" DUE ON 03DEC20 MX PROCEDURE. C/W VALVE MANUALLY CLOSED TI2630Z. REMOVED RT PACK VALVE FLOW CONTROL VALVE AND INSTALLED REPAIRED VALVE. OPERATIONS CHECK GOOD, PER AMM 21-51-12.