What was found
AT 6000' ON DESCENT WITH AUTOPILOT ENGAGED GOT SEVERAL EICAS INDICATIONS ON NOTICEABLE "THUMP" EICAS AND STATUS MSG INCLUDED : ALT CALLOUTS, TERR POSS, SATCOM, NO LAND 3 STATUS PAGE SATCOM SYSTEM, AFDC-L, NO LAND 3 PACK L AND CAPT FSS LIGHT CAME ON FOR 2 SECONDS WENT OUT. HUD POSITION OFF LEFT 300' OF ACTUAL POSITION. AS PER FIM 24-51-00-2, LEFT GCB C24331 AMM 24-22-03-4. RAN LEFT ENGINE AS PER AMM 71-00-00-2, TEST OK. AUTOLAND SYSTEM GROUND TEST PERFORMED AS PER AMM 22-11-00-5 AND 22-31-00-5, TEST OK. EGPWS OPERATIONAL TEST PERFORMED AS PER AMM 34-46-00-5-2, TEST OK. HUD RTS TEST PERFORMED AS PER AMM 31-82-01-5-99, TEST OK. OPERATIONAL TEST OF LEFT PACK PERFORMED AS PER AMM 21-51-00-5, TEST OK. A/C OK FOR SERVICE.