hifi engine

Help Mystere IA 11

I heard a loud bang the other day and the unit went dead. I opened the bottom cover and a broken wire in two places all having to do with the ac plug inlet on the back of the unit. I need a schematic as how to rewire. Somewhere wired in there is a large blue round (ceramic?) .
Has on it top row looks like backwards R U
Second row has DNR
Third row has 20D431K
need help