Vehicle report
Technical service bulletins are instructions a manufacturer sent its dealers about a known fault. They are not recalls and the work is usually not free, but they are the clearest signal of a problem the manufacturer already knows about.
Plunger Valve
Findings have concluded that there were some plunger assemblies installed out of tolerance. The gasket could chaff or lodge in the valve housing set if not corrected. Mounting flange gaskets will be sent to the customer so the discharge valve can be opened to inspect the plunger valve.
Complaint counts are reports filed with NHTSA, not failure rates. A common model collects more of them than a rare one that breaks more often.