I measured voltages and were fine but didn't check out the oscillator.
I've checked it now with a scope and there was nothing on the output.
I desoldered it just to be sure that nothing is pulling it down and result is the same.
So there still is some hope that mcus did not fry...
The oscillator is Epson 9.8304Mhz 5V.
Just for test... would it be ok to replace it with 8MHz which I can get localy? Just to see if leds start to blink again.
My brains say that lower frequency should be safe but I'd rather ask and look stupid than screw up something again...