As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN ATTEMPTING TO DEPART, A LARGE TORQUE SPLIT OCCURRED WHEN ATTEMPTING TO PICK UP INTO A HOVER. INSPECTION OF NR 1 ENGINE BY PILOT REVEALED THE PC SAFETY VALVE PARTIALLY CLOSED. PILOT OPENED VALVE AND COMPLIED WITH POWER CHECK AND FOUND NORMAL. MAINTENANCE INSPECTED VALVE AND ENGINE. RELEASED AIRCRAFT FOR SERVICE.