As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TECH SERVICES REQUEST FOR FOLLOW-UP TO AERMETRIC FAULT 21-55091(RT PACK TCV IS OUT OF RANGE OR VALVE IS NOT IN COMMANDED POSITION)----(#PRI2)----ETOPS SIGNIFICANT SYSTEM----. GROUNDED - YES. TECH SERVICES RECOMMEND TO REMOVE AND REPLACE THE RIGHT PACK TEMPERATURE CONTROL VALVE AS PRECAUTION. REF AMM 21-51-10/401. (RESOLVED ON W/O: 1967902 TASKCARD: N/R-00001 ) TASK CARD COMPLIED WITH.