An easy test is to set the OI panel lights to different values in the RC code.
Code:
Pwm1_green = 1; //or = 0
Pwm1_red = 1;
Pwm2_green = 1;
Pwm2_red = 1;
Relay1_green = 1;
Relay1_red = 1;
Relay2_green = 1;
Relay2_red = 1;
Switch1_LED = 1;
Switch2_LED = 1;
Switch3_LED = 1;
Another test is to send hardcode values out to some of the Relay Outputs, then measure the outputs with a multimeter to see it they are what you expect.