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Which board creates the analog output?
Top or bottom board?

I have a new one here that has no output on either channel
Analog ins both work fine .

Everything tested good re cables etc by dropping on another uc300eth onto the break out board stack .

The top board (the processor) sends a 0-3.3V digital PWM signal to the bottom board which converts that signal to 0-10V analog signal.
So, both boards take role in generating the signal.
Try to exchange the -5LPT motherboard for that UC300ETH top module, then if the analog signal works that way then the top board is OK and the bottom one has a problem, otherwise the top board has a problem.
It is better if the top board is OK, because it is much more expensive than the bottom board.