Why do leds flash randomly on faulty mackie dfx-6 ?

I've found Mackie to be quite helpful when problems arrise. Their consumer support link is-

Contact Support Mackie

The "rude solo" wil only flash if something is soloed. You need to check again as there is STILL something soloed. The left meter is because that is showing the channel that is being soloed. Once you unsolo everything, the meters wil display full left and right as usual.

Turn gain CCW. plug microphone in, mute the channel. turn gain CW until peak LED flashes (while singing loud!) and turn gain back a little bit.
Take the channel fader down, unmute the channel. Put masters at 0dB (near maximum) and adjust the loudness with the channel fader to what you like.
EQ: it always depends on your location. Keep it flat. You might like to reduce at about 200-300 Hz. Cut the low end (Hi Pass Filter = on) or if no HiPass reduce "bass" for about 6...10dB.
ok?

It would be very unusual if the blue LED is burned out. They should last a million years. I suspect the power supply has a problem.

junn561,
Thank you for asking me directly to help you with your problem. However, either the question you are asking is not within my area of expertise (I am an automotive repair technician), or the question is incomplete and does not contain enough information for me to help you.

It is likely that the O/P transistors have blown, especially if the fuse keeps blowing and the O/L led comes on. It's a repair shop jobbie

Check the power going to the main output with a multimeter. It may be a simple fuse or the output board may have come disconnected from the main board.

Run your speakers cables to your stereo "outs" (L/R) then run your sub off of one of your aux "outs" or sub group "outs" (make sure you assign channels to sub group out).

This probably means there is a failure and the internal protection circuits have activated. It will probably have to go to a shop for repair.

If power was NOT turned off immediately after the spill, it is likely electrolysis has eaten through one or more circuit trace(s). If power had been turned off right away and the unit dried it would have been OK. The unit will have to be taken to a shop and repaired. This could be an expensive repair.
If the mixer is working properly audio wise and only the clip LED's are lighting, the cost may be mostly labor to repair the circuit board damage.