What was found
CLIMBING OUT OF FL 300 WE RECEIVED AN EICAS "CAB ALT" MESSAGE. CABIN ALTITUDE EXCEEDED 10,000 FT. AS INDICATED BY THE CABIN ALT INDICATOR, WE COMPLIED WITH PHASE ONE ITEMS, DONNEP THE OXYGEN MASKS AND INITIATED A DESCENT TO 10,000 FT. WE COMPLIED WITH CAB ALT QRH PROCEDURES, DURING DESCENT TO 10,000 FT. WE ALSO RECEIVED AN EICAS CABIN AUTO INOP CAUTION MESSAGE. WHICH SUBSEQUENTLY DISAPPEARED. CABIN ALTITUDE RETURNED BELOW 10,000 FT WHEN WE LEVELED OFF AT 10,000FT.