I uncovered a pair of KLH model 6 speakers serial numbers 003756A and 003747A in my mother in law's attic. The cabinets are in good shape, but there is no output from the tweeters. My guess is that these were made early in the model run, since the cabinet is epoxied together and there is no zip code on the backplates. Threads on AK suggest that either the crossovers capacitors or tweeters (or both) are bad. Since there is nothing to lose, I'd like to attempt repair. What is the best way to proceed?