As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON APPLING TAKEOFF POWER AT 20 KNOTS. RIGHT PACK TRIPPED OFF. ABORTED AND RETURNED TO GATE. LOW SPEED INSPECTED AND RESCHEDULED PER MEL 21-1-1 CAT C06019. INFORMED MXC PLACARDS INSTALLED. (ITEM RESOLVE UNDER MDDR: C06019) REPLACED FLOW CONTROL MOD AND S/O VALVE PER M/M 36-12-61. OPS GOOD. REMOVED FROM MEL.