What was found
ENG CNTRL FAULT L, PRESSURIZATION FAULT AND GEA FAIL 2. WHILE RUNNING THE CHECK LIST FOR GEA FAIL 2 IT INSTRUCTED US TO PRESS AUTO/MAN FOR THE PRESSURIZATION, WHEN WE PUSHED IT THE CABIN DUMPED ALL PRESSURE.(ATC DECLARED EMERGENCY) CORRECTIVE ACTION: REMOVED FAILED GEA #2 P/N: 011-02635-01 S/N: 3QS005956 AND REPLACED WITH A REPAIRED UNIT P/N: 011-02635-01 S/N:3QS006508. PERFORMED A SUCCESSFUL SOFTWARE/CONFIG LOAD ALONG WITH A SATISFACTORY OPS CHECK. WORK PERFORMED IAW CE-680A AMM 31-40-15, 42-10-15