What was found
YAW DAMPER (YD) 1 TRIPPED OFF IN CRUISE. RESET (REPEATEDLY), GOT PROGRESSIVELY WORSE DOWN TO 2 SECONDS BETWEEN RESETS AND FAILS. ASSOCIATED: AP TRIPS OFF WITH YD1, AI NR 1 BLANKS OUT AND MAG FLAG APPEARS WITH YD1. VSI NR 1 ERRONEOUS INDICATIONS - SHOWS UP TO 1400 FPM DESCENT AND CLIMB WHILE IN LEVEL FLIGHT AND VSI NR 2 SHOWING 0 FPM UP/DOWN (IE LEVEL). STALL FAIL OCCURRED DESCENDING THROUGH 14,000 AT 3200. YD2 FAILED ON LANDING. REPLACED NR 1 AHRS COMPUTER. OPS CHECKS GOOD IAW CRJ MM 34-21-11.