No small submersibles made after 1970 can be repaired. You can take it apart and inspect it. You can possibly get it put back together. But you won’t find any parts unless you salvage off a pump that is in worse shape than yours. There is just a bushing in the top of the motor, no ball bearing. The bottom will have a Kingsbury type thrust bearing. (Graphite and Teflon shoes with a Stainless plate running on them) New ones would be polished like a mirror if you want a comparison. The main problem is the windings. It is called a canned stator. Which is copper winding encased in epoxy. When the stator gets hot, it swells up, and never goes back to its former size. This causes drag on the rotor, grinds off particles, and things just get worse from there. And it is a water filled motor. If the water leaks out the seal or diaphragm is bad. If the water doesn’t leak out, the motor will freeze if you leave it in the shed.
If the pump is good you can put another motor on it. If not, replacing impellers will cost you more than a new pump.
You can have fun and learn some things by taking it apart. But I wouldn’t count on it making a very good spare.