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I'd second the recommendation, trace the drain line to make sure it is going into the bilge. As opposed to leaking, cracked, etc. into the bilge or another water source. As the owner, part of your job is 9eventually!) knowing every inch of the boat, especially the inches you can't easily see.
I wouldn't just replace the bilge pump if it works. If you want insurance, add a second pump, because all the electric bilge pumps fail, sooner or later. With two you double your odds of having at least one working. And new wiring that hasn't been waterlogged or given a chance to corrode is a bonus.
The best trick I've seen with an icebox drain, was to add a manual pump (either hand pump or foot pump) at the galley sink, and plumb the icebox drain to that pump. We used to put the stopper in the sink, pump the ice water into it, and use that to keep drinks cold for the day. Kept the bilge dry, made good use of the ice water. If you don't want to do that, consider getting a blivet (flexible tank) or asking your local diner for one of the five gallon blivets they use in their milk machines. (They are food grade, heavy plastic, but come filled with milk & get thrown out when empty.)
Rinse it out, run the drain hose into the blivet, and that way you can still catch the drain water in the bilge--while keeping the bilge dry. Just dump it out when you add more ice.
Damp bilge is a bad idea. Crud grows in it, keel bolts corrode, you can't always keep it bone dry but you can keep it less wet.