What was found
AT FL350 CREW GOT (RUDDER BOOST INOP), (PRIMARY PITCH TRIM), (MACH TRIM FAIL) FAULTS. CABIN PRESSURE BEGAN DUMPING AND A SPLIT BETWEEN THE PILOT/ COPILOT AIRSPEED OF 140KTS. CREW INITIATED EMERGENCY DESCENT RED CABIN ALT CAS ILLUMINATED DURING DESCENT WITH CABIN DIFFERENTIAL INDICATION DASHED OUT SECOND OCCURRENCE OF SIMILAR PROBLEM. TO CORRECT PREVIOUS EVENT, MX REPLACED AN AIR DATA COMPUTER. FSR BELIEVES A BAD ADC WAS INSTALLED (POSSIBLY AN NFF UNIT) MX INSTALLED A RECERTIFIED ADC IN THE NR 2 POSITION AND MOVED THE NR 2 ADC TO THE NR 1 POSITION. GROUND TESTING AND RUNS NORMAL CHECK FLIGHT WILL BE PERFORMED AND AIRCRAFT MONITORED CLOSELY.