What was found
AT 1000 FT AGL CAPT CALLED FOR CLIMB THRUST, AUTO THROTTLE DROPPED OFF AND ENG NR 1 DROPPED TO IDLE THRUST. RETURNED TO AIRPORT USING MANUAL THRUST WHICH OPERATED NORMAL. DE-MODED ACFT AFTER FMGC -108 UPGRAGE PER E.O. 22-10-28. REPLACED FLIGHT MANAGEMENT AND GUIDANCE COMPUTER -- MOD TO BE REACCOMPLISHED COMPLETED WITHIN 14 DAYS. CURRENT HISTORY: EO 22-10-28 (FMGC UPGRADE) WAS COMPLIED WITH PRIOR TO EVENT. VERIFIED THE NR 1 POS -108 COMPUTER BAD USING A/C AS TEST BED.