The fly is fine if you saw it produce a raster. The wax/tar coatings on flys peel/crack off from age sometimes....It's no big deal. If it is arcing anywhere or you are worried about that then recoat it with wax or sensor safe RTV silicone. I've seen good looking flys dead, and scary looking flys work...Electricity don't care what it's path looks like as long as it has a path.
The only time to worry about a fly is when it has not produced HV for you and there is a LOT of melted wax (a few drops is normal in some sets) and possibly evidence of fire in the HV cage.
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