Capacitor Filter PCB Repair

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I was welding one day last summer with the Powcon 300ST. I think I was pushing it too hard when I was making some stands welding with 5/32 8010's, and suddenly I turned and looked, didn't hear a noise or nothing and black smoke was billowing out the backside of the 300ST, I quickly unplugged it. After much crying in my beer that night, the next day I took the cover off and found what the manual identifies as a Capacitor Filter PCB board with three small capacitors , three varistors, and six diodes and a few resistors. It has a part # of 100199-001 in the manual and printed on the board.


Everyone knows you cannot just run out and buy another board. So I would like to attempt to repair the board myself if I can get the right values for the damaged components on the board and get those components from a electronic supply house. I know nothing about electronic repair. I know I will need the right tools for the job though. I have nothing to lose if I screw up.1. So has anyone ever repaired their own boards before and therefore has the knowledge and experience they could share, what tools are needed? 2. The only components with visible damage are the three capacitors. Does anyone have a Powcon with those values readable they could give me? (The 100199-001 board is the same on 300SM, 300SS, and several others I downloaded the manuals for.)3. Can anyone with experience tell me how to test a varistor, a diode and resistors. These dont have visible damage but may still be damaged.  All I have is regular VOM meters. Do I need something else to test with? Anyone with electrical knowledge would be greatly appreciated.