As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MAINTENANCE SERVICES FROM THE LUBE CLUSTER OF AN AUXILLARY POWER UNIT THE BYPASS VALVES WHERE NOT TESTED IN ACCORDANCE WITH THE CMM REQUIREMENTS. THE VALVES WERE ONLY TESTED VISUAL AND FUNCTIONALLY AND NOT AS REQUIRED BY TEST PROCEDURE.