What was found
RECEIVED LANDING GEAR RETRACT FAULT--UNABLE TO RETRACT LANDING GEAR N T/O FROM RWY 28 KORD. TRIED BOTH SYS 1 AND SYS 2 WITH NO LUCK. REF TO AMM 32-31-71-4, TESTED PROXIMITY PROCESSING UNIT AND FOUND FAULT "BL", LT BOOGIE SENSOR. FOUND LT PITCH DAMPER AT 75 BARS. CHARGED TO 85 BARS IAW MM 12-12-32-0 FACT 10DEC09 22:01 ORD R JACKED ACFT IAW AMM 7-11-00-0, LUBED BOGIE PIVOT POINT IAW AMM 12-22-32-0, DEPRESSURIZED, THEN RESERVICED BOTH LDG PITCH DAMPERS IAW AMM 12-12-32-0, PERFORMED SUCCESSFULL GEAR RET AND EXT TESTS USEING BOTH NR 1 AND NR 2 SYS IAW AMM 32-31-00-5.