for a 955, the 120V fuse should be 3A, the 50V fuse is 5A and the 6V fuse is 10A. These days all AGC fuses are rated 250V.
if you aren't sure which fuse is which, the 6V fuse has a solid blue wire on it, the 50V fuse has a solid orange wire, and the 120V fuse has a white/blue wire on it.
the only way to melt a transformer is having no fuse (miswired or shorted) or an absurdly large fuse in there.
unless you have a winner, the hopper motor, safety motor and override solenoid (if you have the old style hopper) aren't powered.
you could pull out the reels and stick back in the hopper. If your problem comes back, you probably have a short on the hopper and maybe someone tried to find it using the old "wrap foil around the fuse and see what catches fire" technique.
post a pic of the fuses if you aren't sure. If having trouble posting due to file size, you can email highest possible resolution pic to slotpics@cdyn.com. A pic of the entire front of the game would be great too.