As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOOSE CRIMP NUT FOUND AS DESCRIBED IN MFG MANDATORY SB NR 518C. IAW SB 518C, THE THERMOSTATIC BYPASS VALVE FOUND FAULTY IS NOT ONE OF THE AFFECTED MODELS LISTED. WE RECOMMEND THAT 518C SHOULD BE UPDATED TO INCLUDE ANY BYPASS VALVE USING THE CRIMPED NUT.