What was found
BELOW 1000 FT AGL BLEED 1 OVER PRESS MASTER CAUTION EICAS MSG ILLUMINATED CABIN ALT CONT CLIMB EVEN THOUGH (400 FPM) A/C ALT STABILIZED AT 15000. CABIN ALT STABILIZED AT 7300. CREW EXPERIENCED SIGNS OF HYPOXIA. ALSO PACK 1 AND 2 OFF ADU EICAS MESSAGE AND AUTO THROTTLES DISCONNECTED ON CLIMB OUT. RETURNED TO FIELD. LANDING UNEVENTFUL. REMOVED FROM SERVICE. PERFORMED PRESSURIZATION LEAKAGE FUNCTIONAL TEST IAW E-175 AMM TASK 21-31-00-720-802-A. FUNCTIONAL TEST PASS. NO FURTHER DEFECTS NOTED. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.