@xidnpnlss Your first challenge will be de-soldering! If you’re not up to investing $200 or so for some decent soldering kit, you might consider taking the crossover to a local tech shop or friend who can undo and redo the joints for you. Of course, you could get by with a 25 Watt iron and a ‘Solderput’ sucker (nothing less, no substitutes).
The component that blew up on the one board was one of those ‘$2.00 resistors’ referred to above, often termed ‘sand resistors’ —they are not expensive. The other commonly replaced items include any electrolytic (‘can’) capacitors, as they dry/wear out after years of service, even if they’re not used. Again, not a terribly expensive part unless you’re going for super high quality. Parts Express can hook you up. Would be a shame to have them fail soon after you get the speakers all reassembled. Original performance will also be restored.
Good job on getting the first woofer out. I approve of your method, for what it’s worth. Good luck with your project, I’m sure you’ll be pleased with the result.