As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT LEFT PROP FEATHERED AT LIFT OFF AT DIA. RETURNED TO GATE WITHOUT INCIDENT FOUND BETA SYSTEM OUT TO RIG. FOUND BETA VALVE STICKING ALL THE WAY OUT. SUSPECT BETA CABLE WAS STRETCHED. RERIGGED BETA SYSTEM AND RETURNED TO SERVICE.