Klipsch La Scala diagnostics/repairs

I bought a pair of Klipsch La Scala speakers brand new back in 1978 (yeah I'm an old guy now).  They've been wonderful, but in recent years they don't sound like their old selves.  It could be a factor that several years ago, during a corporate relocation, they spent a long hot summer in a non air conditioned storage down south.  Whether it's the crossovers or the speakers themselves, something ain't right.  Do any of you folks have recommendations for how I might go about getting these old friends checked out and brought back up to standard?  I now live in Wilmington, NC, and am expecting that I'll likely have to take them out of town to get them in the right hands.

Thanks for your help