As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TECH SUPPORT...DUE TO CHRONIC RIGHT PACK TRIP ON T/O ROLL, REF FIM 21-53 T/820.WOULD START BY CHECKING THE BYPASS CHECK VLV. ASSY FOR OPS AND MAKE SURE ITS INSTALLED AS THIS WILL CAUSE TRIP ON T/O ROLL IF MISSING OR BAD. CARRIED BY ELB REF AMM 21-51-11-400 OPS CHECK AND LEAK CHECK VALVE GOOD. REMOVED AND REPLACED STANDBY TEMPERATURE CONTROL VALVE RH VALVE, CONTROL, OFF 58-2151-9-0004 8734 ON 58-2151-9-0004 0828 SEE LOG PAGE 3555255 FOR CORRECTIVE ACTION( O/H SWITCH R&R).