As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB PILOT REPORTED RIGHT PACK TEMP EICAS MESSAGE AC RETURNED TO FIELD (ATB) AND MTX GROUNDED AC . MTX TROUBLE SHOT AND FOUND R/H TRIM AIR CHECK VALVE INSTALLED INCORRECTLY, REINSTALLED CHECK VALVE CORRECTLY AS PER B767 AMM 21-61-05. PERFORMED OPS CHECK OF RIGHT PACK FOR TWO HRS NO OVERHEAT ISSUE. REMAINS NO ETOPS.AND RETURNED AC TO SERVICE