As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENROUTE, THE NR 1 AND NR 2 GPS WERE UNABLE TO LOCK ON TO THE SATELLITE SIGNAL. THE AIRCRAFT RETURNED FOR MAINTENANCE WITH NO FURTHER INCIDENT. REMOVED AND REPLACED THE NR 1 AND NR 2 GPS NPU. GROUND OPS CHECKS GOOD AND THE AIRCRAFT WAS RETURNED TO SERVICE. FLIGHT VERIFICATION CHECKED GOOD ON BOTH UNITS ENROUTE.