As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INFLIGHT DURING ALL TURNS CP ND HEADING FLICKERED WITH IN A FEW DEGREES BACK AND FOURTH. WOULD NOT STABILIZE. SPURIOUS FMC MSG VERIFY POS: FMC-FMC DURING FLIGHT. GROUNDED - YES. REBOOTED A/C DUE TO MULTI. FAULTS. ACCOMPLISHED FMC OPS TEST REF B737-9 AMM 34-61-00. OPS NORMAL. NO SENSOR FAULTS. OK FOR SERVICE. NO HISTORY FOR PAST 30 DAYS.