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When you have a DC voltage on the output, check your capacitors in the amp. Looks like the big electrolytic is defect.
I don't have a manual of this amp, so I can't verify if I'm right and what cap you should look for.
Though any transistor(s) might well have gone and the capacitor could be changed, I see no reason to change any resistor unless it's burnt up or giving an incorrect resistance reading. A multi-meter will tell you if a resistor is working or not, if it's not dead or weak it won't make a lot of difference to the circuit, but replacing it will simply cost you more money!
Make sure the three position slide switch is set correctly for the stereo usage, that is NOT the bridged OR the Mon mode.
MAKE SURE the pan pots are set to middle as they control the spit of the audio to the two channels.
This is a class "D" amplifier (switching) and there really isn't any fuse for a single channel.
MAKE SURE your speakon connections are good by swapping your speaker cables.
I repaired my unit and had to do that without schematics... Behringer will not give them out. Mine had a severe arc-over on one side power amp taking out about ten transistors and diodes and one swithcing regulator chip. Had to cut out the "cancer" of the burned board.
This unit uses a complementary output stage that is made up of one transistor on one side and a pair in parallel on the other. This drives the inductor/capacitor filter... I think the switching frequency is between 100KHz and 1 MHz as I recall. All those transistors were gonzo. It also fried the main power switching transistors in the power supply, several smaller transistors, diodes, and the switching regulator chip.
Also two 10 ohm power resistors were fried. They soft start this unit by charging the main caps via two resistors that limit the inrush current.
A small switching supply has to come up first before the main supply which sends the DC to the amp section.
Before asuming it is the power transistors check the power on relay first as mine had the same proble and it was because of the Relay that did not switch on the one channel or amp (remember this is a power amp and consist of two mono amps)