What was found
FT # 2975, FLL-KIN. RETURNED TO FIELD. CLIMBING THRU FL230 BLEED 1 FAIL EICAS MESSG AND SUBSEQUENT PACK 1 OFF. BLEED 2 ON MEL. WE STARTED EMERGENCY DESCENT. EVENTUALLY CBIN ALTITUDE HIGH. REACHED 10000FT CAB ALTITUDE. ONCE STABALIZED PERFORMED QRH RESET OF BLEED 1 DID COME BACK ONLINE; AMM REF 36-11-00/71-00-00/21/00-00 REMOVED & REPLACED ENG #1 FAN AIR VALVE IAW E190 FIM 36-11-00-800-815A. REMOVED & REPLACED AMS CONTROLLER MOTOR DRIVE MODULE IAW E190 AMM 21-00-02-00/400-801-A. OPS CHK OF BOTH AMS CONTROLLER DRIVE AND ENG 1 FAN AIRVALVE.