What was found
UPON ARRIVAL TO AIRCRAFT FOUND AMBER "AUTO FAIL" AND GREEN "ALTN" LIGHTS ILLUMINATED ON PRESSURIZATION PANEL, SELECTOR SWITCH IN AUTO. GROUNDED - YES. NO 30 DAY HISTORY, RESET CABIN PRESSURE CONTROL PNL AND BITE TEST OF BOTH PRESSURE CONTROLLERS - NO FAULTS. REF IFIM TASK 21-31-00-810-850.