What was found
ALTITUDE WINDOW DISPLAY HAS SEVERAL ANOMALIES. IT APPEARS THE IS A "MINUS" SIGN IN FRONT OF THE ALTITUDE. GROUNDED - YES. CONFIRMED ALTITUDE WINDOW DISPLAY IS DISPLAYING INCORRECT. REPLACED MCP AND RESET 9 C/B'S. OPS TEST NML. REF B737-900 AMM 22-11-34. ALL TEST PASS. GROUND VERIFICATION GOOD. ACCOMPLISHED DFCS LRU INTERFACE TEST MCP BITE GROUP 32 AND LAND VERIFY BITE GROUP #49. ALL TEST PASS. ALSO ACCOMPLISHED HGS SENSOR TEST FCC/AT. ALL TEST PASS. REF LWMP CHECKLIST AMM 22-00-01 AND SMM 34-36-00. A/C REMAINS CAT IIIA AUTOLAND AND HGS. A/C PLAC SCREW REFLECTS THE SAME. CLEARS MEL22-16K.