This is not really a beginners repair. You might want to put it aside and work on simpler things for a while. Here is what I suggest
#1 Read about power supplies and crowbars (Art of Electronics 2nd ed).
#2 Figure out how to test caps, transistors, and triacs
#3 Make sure you understand the safety risks of working on high-voltage electronics.
#4 Make a simple linear power supply including a crowbar
# 5 and then try to find someone local to help.
Perhaps more helpfully, the main filter caps are probably bad. I always begin these kinds of repairs by checking the (internal) power supplies.
The crowbar should not have fired without a load on the machine. That probably means that the output was overvoltage. That implies something upstream has failed, maybe a pass transistor.
Be aware that once the crowbar fires, it can take other things with it (check the pre-regulator triac if it has one).