As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACT - FLT 3904 - AFTER TAKEOFF, CREW SELECTED GEAR UP. GEAR DID NOT COME UP. PUT ON MEL. MAINTENANCE REMOVED AND REPLACED THE INBOARD AND OUTBOARD BRAKE ACCUMULATORS, SERVICED THE MAIN SYSTEM ACCUMULATOR IAW SAAB MM. LEAK CHECKED AND RETRACTION CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE. REF: OPER CNTRL NR 2000115SH013. (X)