A modest cost method of try'n to lower the pumps temp would be to use some cheap passive fined sinks attached to the pumps housing with thermal epoxy (a blend of AS5 would allow removal if it's of little to no value.). Should not be to expensive to attach enough of these sinks to see if you gain enough to warrant the cost.
If the pump is in a location of low air flow you could also install a fan to provide more air flow over the pump. I'd install the fan first however to see just what effect the fan alone would have.
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