What was found
IN SYS 1 LANDING GEAR POSITION DETECTOR, TOOK OFF AND ATTEMPTED TO RAISE GEAR. UNABLE. WENT TO SYSTEM 2, GEAR CAME UP, BUT WE GOT MULTIPLE FAILURES. PITCH TRIM 1, ATS, CAPT PITOT OVERHEAT, FO PITOT OVERHEAT, STBY PITOT OVERHEAT, CAPT TAT HEAT FAILURE, CABIN PRESS REG 1., ADC 1. SWITCHED TO ADC SYSTEM 2, FD SYS 2. FO REMEMBER THE FCIF 24-00179 CONCERNING THIS ISSUE. DECLARED AN EMERGENCY. L/G POSITION DET SYSTEM 1 IS DRIVEN BY RELAY 90GB . REMOVED AND REPLACED RELAY 90GB PRECAUTIONARY. REMOVED AND REPLACED PROXIMITY DETECTOR PROCESSING UNIT 54GB GND FUNTIONAL CHECKS GOOD. ALL OTHER SYSTEMS THAT FAULTED A/T / ADS / PROBES OVERHEAT / CABIN PRESS REG / PITCH TRIM AND LANDING GEAR IND ALL GROUND CHECKS GOOD AT THIS TIME PER M/MS A/C OK FOR SERVICE.