Is there more of a story here than what's been told so far? Capacitors are simple to replace and coils almost never go bad. Unless burnt, resistors also rarely go bad and are should be easy to replace. The only issue sometimes is getting access to the crossover.
Of course, the other issue is when people want to change the crossover from what the manufacturer designed. Crossover design, measurement and listening tests are a challenge, so this begs the question of why you want to change the crossover design of a speaker you originally thought enough of to buy.