What was found
WHILE IN CRUISE AT FL410 WE REVIEWED MULTIPLE CAS MESSAGES AND AN AURAL AUTO PILOT. THE MESSAGES WERE AP FAIL, SWPS FAULT, YD FAIL, BLEED 2 OFF, STBY BARO NOCOMP, SWPS ICE SPEED, GSD 1 FAIL(HIGHLIGHTED), AND HSDB FAULT. IN ADDITION, THE LT MLG INDICATED TRANSITION ABNORMAL. REMOVED SUSPECTED DEFECTIVE GSD1 AND INSTALLED AS RECIEVED REPAIRED GSD1. PERFORMED SOFTWARE UPLOAD. OPS CHECKS GOOD WITH NO RELATED FAULTS OR CAS MESSAGES NOTED AT THIS TIME ALL WORK COMPLETED IAW AMM 32-35-00, 31-41-01-000-801-A, 31-41-01-400-801-A, 31-41-01-470-801-A AND 31-41-01-710-801-A