As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW EXPERIENCED A VIBRATION ON TAKEOFF AND DURING CLIMB-OUT FOLLOWED BY A LOUD POP AND A YAW TO THE LEFT AS THEY WERE CLIMBING THROUGH 7,000 FEET ASL, THE LT PROP RPM WAS NOTICED TO DEVIATE AT THAT TIME. THE CREW RETURNED TO MKE WITHOUT INCIDENT. MAINTENANCE REPLACED THE LT ENGINE BLEED VALVE AS A PRECAUTION DUE TO POSSIBLY STICKING. (X)