Ouch!
First check for shorts between the power cord and the primary of the power transformer. Unplug the amp from the wall, turn on the power switch, disconnect the primary of the power transformer from the rest of the works, and use an ohmmeter to check for continuity at the prongs of the power cord, and at the terminals of the fuse holder. If both check open, see what reading you get at the primary of the power transformer. Did you replace the filter capacitor can in amp #2? Check and see if any of the sections have shorted to ground. Good luck!
-Adam