What was found
GEA 1 FAIL CAS DISPLAYED. FOLLOWED BY: PRESN AUTO FAIL/OXY LO PRES CAUTIONS. ALSO ENG NO DISPATCH/ADS 1-2 SLIP ADVISORY MESSAGES. LOSS OF #1 ENG OIL PRESS/OIL TEMPERATURE/FUEL FLOW/BATT VOLT/OXYGEN QUANTITY INDICATORS. ALSO THE GEAR INDICATOR TURNED RED ON THE MAINS AND RED SLASHES ON THE NOSE GEAR. USED THE MANUAL GEAR RELEASE HANDLE AS A PRECAUTION. SUBSEQUENT: REMOVED AND REPLACED GEA1 IAW PHENOM 300 AMM CH 31-41-03. OPS CHECK GOOD. NO FURTHER DEFECTS NOTED. PART NUMBER OFF: 011-00831-00 SN OFF: 46705067 PART NUMBER ON: 011-00831-00 SN ON: 46705685