When I do radio setup - channels 5-8 are not working! But before they were working properly. I'm using latest code from Mission Planner as well as I've tried to compile and upload myself. Receiver is okay - I've checked it with servo. On older versions of APM sometimes I've had same problem, but it was fixed when I upload firmware myself. Now it is not a solution.
Also hardware part (wires, pcb) most probably ok, but in case I'll check them again. It couldn't be damaged - I didn't fly it since that time.