What was found
SHORTLY AFTER T/O A/C ACTED AS IF THERE WAS GROUND SENSING PROBLEM, MALFUNCTIONS TO INCLUDE; ATS 1, PITCH TRIM 1, ALL THREE PITOT PROBE, CAPT TAT, BOTH PRESS CONTROLERS: GEAR WOULD NOT RETRACT SYS 1, A/P 1&2 INOP. INSTALLED NEW NOSE STRUT SENSOR 55GB PROBE HEAT AND PRESSURIZATION CONTROLLERS CHECK OK. ENGAGED BOTH AP. EACH AP ENGAGES.