As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT NR 4586 FROM PIT TO IPT. AFTER 15 MINUTES OF FLIGHT. THE LT SIDE TORQUE INDICATOR WENT TO ZERO WITH NO ENGINE ABNORMALITIES. AIRCRAFT RETURNED TO PIT SAFELY. MAINTENANCE TO AIRCRAFT REMOVED AND REPLACED TORQUE INDICATOR. AIRCRAFT RETURNED TO SERVICE.