What was found
AFTER TAKEOFF FROM MSP COULD NOT SELECT GEAR LEVER PAST OFF. WENT THROUGH ALT PROC. NR 2 GEAR LEVER WILL NOT GO UP PAST OFF AND ALT. PROC #3. A/C SYSTEMS IN GROUND MODE - ALL INDICATIONS ARE THE A/C IS STUCK IN GROUND MODE. REPLACED LANDING ACCY UNIT - OPER. TEST CHK. PER MM 32-09-121. OK. AFTER BLOCK IN, SHUT ENGINES DOWN, ON APU, GOT ELECTRICAL SMOKE IN COCKPIT, SHUT DOWN GASPER, PACKS AND APU, SMOKE STOPPED. REF. TO IT-1 PACK COOLING DOORS CLOSED DUE ACCY UNIT FAILED - OPER. PACKS PER 21-50. OPER. OK.