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schematic question SE/30

Had a quick question on the last traces I have to repair on my se30.  On RP2 Pin 13 I get continuity on R41, but I do not on UD12 Pin 18.  On RP2 Pin 17 I get a beep on R42 but not on UC12 Pin 2.  Same thing with RP2 pin 18, I get a beep on R43 but nothing on UC12 pin 1.  The fact that I get a good connection between RP2 positions and the resistors on the back of the board, where could the break be?  Inside the boards layers?  Should I go ahead and run wires from the RP2 pins to UC/UD pins even though the resistors are showing good continuity?   

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