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Don't rule out the other option that something wasn't installed or spec'd right in the process.
If the pump was installed incorrectly (loose or potentially in a different orientation or incorrect torque) the part itself could be fine... but the part as installed from the factory could have an issue based on process.
They may have deemed that the improper process itself, or driving with it installed improperly could damage the part, so the fix is to install a new-same part (just in case your original pump was damaged due to improper installation), with a corrected process and it's gone.
that seems pretty feasible to me, if a HPFP isn't attached robustly and moves with its duty cycle, it can EASILY produce a consistent cyclical squeak during operation.
This also makes PERFECT sense why there is variation in the final products.
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