If it has run that long and it did overheat I wouldn't suggest trying replace just the rear seals. Too much of a chance of something going wrong with other housing seals.
Tear it all down and spec everything. Especially rotor or rotor housing distortion.
If all clearences are good on seals and rotors use them. You may find that one side seal is too long causing it to stick. Or there is a foreign object stuck somewhere.
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