Prototype boards for testing the RF module along with provisions for a low pass filter have been sent off for manufacture. I’m expecting to see these back in a few weeks. In the meantime below are links to the Gerbers for the test board as well as Kicad Modules for making your own boards that use the DRA818V module.
I came across a DR-635 that was dead. After removing the panels it was clear that the pre amp IC had failed. Note that the heatsink comes out of the board thru a slot for cleanup. Below are pictures of the repair. I used solder paste and a hot air station to repair the unit after initial trace and PCB repair using superglue (Don’t breath fumes). Parts were purchased from Alinco.