As much as I feared it, It happened

I have absolutely no idea when, but one of the TW025 tweeters of my tik10's seems to have taken damage, luckily the other tweeter is ok.

As I play a sine tone between 3000-6000Hz, at lower volumes, the damaged tweeter sounds fine. But when I turn the volume knob beyond a certain point (still not very loud), instantly a very audible shrill distortion is added to the sound.

What's odd, I've never heard the amplifier to clip or played music at very loud levels. The speakers have always sounded a bit bright, so maybe the amplifier's tendency to lean to the brighter side has finally taken its toll.

I believe the original TW025 tweeters are no longer available anywhere, so what's the best replacement? How about a repair? Is it possible at home?