As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTOLAND FAIL AT 30RA WAS ON CENTERLINE BUT DRIFTED ABOUT 50FT LEFT BETWEEN THERE AND TOUCHDOWN. POTENTIAL SIGNAL INTERFERENCE FROM PLANE ON ADJACENT TAXIWAY. APPROACH CONDUCTED IN VFR CONDITIONS, 16R SEA. GROUNDED - YES. ACCOMPLISHED B737-800 FIM 22-11 TASK 825, LAND VERIFY TEST PASS & HGS SYSTEM TEST PASS REF HGS-4000 SMM 34-36-00.