Well, you can see all the amenities and options, There is no warehouse stocked with parts for a 1988 model boat. If I recall, owe has been owned/operated, by several companies over the years. Its not unusual for all old data to disappear when a boat company is bought out.
You clean them with soap and water, windex, scale remover, vinegar, or bleach water. Flush them well if used in salt water. Treat them with vinyl conditioner.
Maintain the engine according to motor manufacturers recommendations.
Keep all wiring connections clean and tight.
Steering cables are used until replaced, they are not serviceable.
Same with the throttle and shift cables.
Maintain your trailer bearings, inflate tires to recommended pressure, and replace them based on age and condition, not miles.
You keep the boat DRY inside when not in use.
And keep your batteries charged up.