What was found
AIRCRAFT WAS GROUNDED: LANDING GEAR WOULD NOT COME UP AFTER TAKEOFF. PLEASE SEE ADDITIONAL DISCREPANCY INFO REF MIC 7582286, 7582786. DECESION MADE TO RETURN TO BOS AIRCRAFT LANDED OVERWEIGHT WITHOUT INCIDENT. MAINTENANCE ACCOMPLISHED LANDING GEAR T/S PER FIM TASK 32-30-00-810-815, NO LG DOWNLOCK PINS INSTALLED, SUSPECT OPENING OF MANUAL EXTENSION DOOR BEFORE FLIGHT CAUSED DISCREPANCY, INITIAL EVALUATION GVI CHECKS OK, JACKED AIRCRAFT PER W/C 08L00007004, MULTIPLE GEAR RETRACTION & EXTENSION OPS CHECK OK. AIRCRAFT OK FOR SERVICE AT THIS TIME.