I believe that U37 and U38 are the BATRAM chips, they were for sure swapped to the new CPU. The CPU was replaced because I could not communicate with the controller, no heartbeat LEDs on MSU, PIO and CPU. I tried swapping the MSU and PIO first, still no heartbeat or communication. After swapping the CPU (twice, found a bad board on the job labled good), I am able to communicate with the controller. I will try a ReInit on Monday.