Ch6 and Ch7 problem

It seems I have channels 6 and 7 mixed for Devo protocol and RX1202.

Ch6 - Mix=Simple, Src=ELE, all other is default
Ch7 - Mix=Simple, Src=AIL, all other is default

Both channels work simultaneously if I move elevator to the UP or aileron to the LEFT, but not work if I move elevator to the DOWN or aileron to the RIGHT. At channel monitor both channels work as expected. I don't understand what is happened. All other channels with the same setup work normally.

If for Ch7 Mix=None, Ch6 work only if I move elevator UP.

Can anybody check it ???

Probably it can be defective RX1202.

Yes, Ch6 and Ch7 output pins are shorted, but I don't see at circuit board any thing that shorted these pins.

Solved. It was hair thin solder bridge.