As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT ALPHA VANE LIGHT AFTER ENGINE START. GROUNDED - YES. REMOVED AND REPLACED OVERHEAD P5 PROBE/WINDOW HEAT PANEL IAW B737-900 AMM TASK 30-41-41-000/400-801. INSTALL TEST PASSES, HEATERS WORK NORMALLY. HAD QUALIFIED TECH RUN ENGINE TO CHECK AUTO FUNCTION REF AMM 30-31-00-750-801, ALL LIGHTS EXTINGUISHED AS NORMAL.