As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER T/O RAISED GEAR, MAIN GEAR DID NOT RETRACT, NOSE GEAR DID. RAN THE GEAR DISAGREE CHECKLIST, THEN GOT A L HYD QTY EICAS MSG. RAN THAT CHECKLIST. LANDED TAXIED OFF RUNWAY AND NOTED RF W/ DECREASE HYD QUANITY. RAN THAT CHECKLIST AND GOT TOWED TO GATE. DID NOT SHUT OFF PUMPS UNTIL LOST PRESSURE. FOUND B NUT ON NR 1 ENG HYD PRESSURE LINE LOOSE, SECURED. INSPECTED AND REPLACED BOTH CASE DRAIN AND PRESSURE FILTERS. RAN ENG, NO LKS NOTED. PUMP CK OK