As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE CHECKING C/BS FOUND P18-3 (A-1) OPEN WING ANTI ICE VALVE. GROUNDED - YES. OPEN P18-3 INSP NO DEFECTS CLOSED P18-3 ACCESSED L WING ANTI ICE VALVE DISCONNECTED CLOSED C/B TESTED R WING TEST PASS RECONNECTED L WING VALVE TEST FAILED REF B737-800 AMM 20-60-01-860-801 & AMM 30-11-11-860-006. R&R LH WING THERMAL ANTI ICING SHUTOFF VALVE IAW AMM TASK 30-11-11-000-801 AND TASK 30-11-11-400-801 OPS TEST AND LEAK CHECK GOOD C/B ON P18-3 REMAINS CLOSED.