What was found
AURAL "ALTIMETER" CALL MADE BY AIRCRAFT DESCENDING THRU FL180 WITH ALTIMETERS SET TO LOCAL ALTIMETER SETTING CORRECTLY. AIRCRAFT ALTITUDE CONFIRMED WITH ATC AND CORRECT. "ALTIMETER" ALSO SHOWN ON NAV DISPALY ASSOCIATED WITH AURAL CALL. GROUNDED - YES. PERFORMED DFCS BITE CHECK PER B737-800 FIM 22-11 TASK 801. NO CURRENT STATUS FAULTS. ALSO PERFORMED ALT ALERT GROUP 15 TEST. NO FAULTS NOTED. NO FLIGHT LEG FAULTS (LAST).