As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLIMBING THROUGH FL 180, NR 1 RUDDER HYD CAUTION. RETURNED TO FIELD. LANDING UNEVENTFUL. C/W FIM TASK 27-20-00-810-804, PERFORMED OPS TEST OF RUDDER CONTROL SYS IAW AMM TASK 27-20-00-710-802. OPS CHECKED GOOD NR 1 RUDDER. HYD CAUTION DID NOT RETURN. NO PRESENT FAULTS LOGGED IN CDS. ACFT OK, RETURN TO SERVICE.