As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT ALPHA VANE FAILED (HEAT). GROUNDED - YES. GVI AND CYCLED F/O PROBE HEAT IND AND AUTO HEAT C/B'S AND GVI WINDOW AND PROBE HEAT MODULE P5-9 AND ACCESS WIRING AND CONNECTORS. NO DEFECTS NOTED. SYS TEST OF PROBE HEAT CHECKS OK REF B737-900 AMM 30-31-00-730-801. R ALPHA VANE HEAT CHECKS OK REF AMM 30-31-00-730-801.