As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TRANSFERRED FROM LOG PAGE 3715116 ITEM 1 MEL 21-27. C PACK 1 OVLD PACK 1 OVLD EICAS MSG DURING TAKEOFF ROLL. TAKEOFF ABORTED LOW SPEED. INSPECTED & FOUND COUPLING 11 WITH LARGE HOLE BLOWN THROUGH IT. R & R COUPLING IAW AMM 21-51-03 & ETN-EM-21-056. OPERATIONS CHECKED GOOD, LEAK CHECKED GOOD. THIS ACTION RESTORES MEL21-27.