I have never tried to repair a heating element, just replaced them. Looking at the old ones when I pulled them out I don't recall
seeing anything repairable. It is basically a heavy, high resistance wire that gets hot and with age a break can develop in the wire.
On the other hand, they aren't special items. If you could find one to fit it would not have to be the same brand, just the same voltage and current
Probably nothing to lose by taking out the element. There will be a gasket
to keep it from leaking and if you damage the old one you can make a new gasket
with material and a tube of gasket sealer from an auto parts
store. Worst case scenario if you create a leak you cannot fix you can bypass the heater with a short section of hose until you can get the right parts