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Micro Matic has specialty fans just for that purpose. They pick up cold air on the bottom of the fridge and pump it up the tower. I have adapted its use to cool the shanks on my kegerator.
For a two tap tower on top of a mini fridge, glycol cooling might be more trouble and expense than it's worth. Depending on where you live, a small fan and some rubatex insulation may be all you need.
+1 to using a fan. Cheap low maintenanceFor sure change the lines. You have no idea how well they were managed in the past. Line is cheap and worth it compared to dumping a batch.