What was found
*** EMERGENCY DECLARED BY CREW *** CAPTAIN AHRS: DEPARTING MDW WHILE LEVELING AT 3,000 FEET AMBER YD FAIL, AP FAIL AND AHRS FAIL ILLUMINATED. AFTER A FEW SECONDS THE OTHER AHRS FAILED AND THE AMBER MESSAGE BOTH ON ATT STBY ILLUMINATED ON PFD. ALL OTHER CAS MESSAGES EXTINGUISHED EXCEPT WHITE WSHEAR NOT AVAIL. // SIGNOFF// REMOVED AHRS UNIT #1 PN: 011-00868-10 SN:42033653 AND REPLACED WITH CUSTOMER SUPPLIED REPAIRED AHRS UNIT #1 PN: 01HL0868-10 SN: 42036120 WITH REF TO EMB-505 AMM 34-21·01. REMOVED AHRS UNIT #2 PN: 011·00868-10 SN:42023796 AND REPLACED WITH CUSTOMER SUPPLIED REPAIRED AHRS UNIT #2 PN: 011-0086-10 SN: 42036624 WITH REF TO EMB-505 AMM 34-21·01. PERFORMED AHRS #1 AND #2 SOFTWARE UPLOADING WITH REF TO EMB-505 AMM34-21-01. PERFORMED AHRS #I AND AHRS #2 OPERATIONAL TEST WITH REF EMB-505 AMM 34-21-00, OPS CHECK GOOD AT THIS TIME.