As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON ARRIVAL FOUND RT CABIN TEMP CONTROL SYSTEM MSG 21-23502 (SECOND STAGE TURBINE BYPASS VALVE AC MOTOR IS NOT IN COMMANDED POSITION ) AS DETECTED BY RCHANNEL 2 TEMP CONTROLLER. REPLACED 2ND STAGE TURBINE BYPASS VALVE ON RIGHT PACK, OPS TEST OK.