Performed a complete coolant change-out of the heat exchanger. Completely closed the flow bypass valve and monitored the pressure for over 6 hours without any issues. The filter inlet pressure of the Ht Ex fluctuated between 72 to 76 psi as the coolant temperature cycled between 75 - 79.5 deg C (set point = 80 C).
We will continue to monitor the problem.
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