That's a film capacitor .1uF and 250volts. The markings on the zener don't seem to match the numbers you gave, but I can't see what they are from the picture. If it's a z18b, it's an 18v zener, and probably .5 watts. You'd have to take it out and look carefully all the way around it. Did you test it? Can you find another zener on the board with the same markings?
That said, I doubt those are the causes of your failure. You'll have to do a lot more testing other than quick visuals! Check all the electrolytics and solder joints too.