Put on some tea, and search the Sprint side of this forum ('Advanced Search') for rear axle service, fuel fittings, and ignition switch, to begin with.
Hopefully you replaced the broken fuel fitting with a metal bit; the plastic ones are bad about breaking. The hot setup is to replace all four quick-connects with metal ones. Several threads on the topic. There was a factory recall to replace two of the fittings, so you may have a couple metal bits already.
The rear axle service is a critical maintenance action, due every 12K miles/KM.
Another common failure in the 955's is a wiring problem in the left harness, about four inches down the handlebar from the clutch lever. There is an aluminum crimp that corrodes and fails. The symptom of the failure is the bike will not crank. And, the horn doesn't work. The fix is to cut the vinyl carcass, expose the black/yellow wires, cut at least an inch or two back on all three wires, and replace with clean wire with soldered connections, protected with grease and heatshrink tubing.
The old steed will probably need new shoes, but otherwise, I hope you both have a great summer!
Welcome to the Forum!