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I would definitely do a water pump on those every two years. The high pressure/low volume pumps take a set in the impeller blades pretty easy. Also, the brass hubs of the impeller would come unfastened from the rubber, leading to a near instant overheat, before you even knew what happened. Changing the impeller every two years prevents this. Also make sure the gear oil is fresh. Other than that, I wouldn’t be picking any scabs on it. One thing that was known to be a problem was wire insulation failing. Just look at it and make sure it’s not falling off, exposing bare wire that could cause a short and a fire. If the insulation looks good, leave it be.
Long live American manufacturing!