As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE WAS MAKING A HIGH PITCHED NOISE. REMOVED ENGINE ASSY AND DISASSEMBLED. FOUND COMPRESSOR DIFFUSER VANE ASSY CRACKED IN SEVERAL SPOTS AT THE BRAZE JOINTS. THIS PART WAS O/H 529.2 HRS BEFORE. THIS IS THE 3RD VANE ASSY WE HAVE FOUND LIKE THIS. PROBABLE CAUSE UNKNOWN COULD BE BAD SPOT WELDING. INSPECT CLOSER.