One speaker putting out -3db less?

These are all great points. I used a handheld spl meter in the center and moved my balance left and right.It's a noticeable difference. I noticed my soundstage had moved slightly to the left, particularly the vocals, that's what caused me to check it. I'll do a orw thorough check later tonight. Also, don't know if this could have done something, but I've suddenly had a terrible static issue. I grabbed my speaker a couple of tims now to adjust it and been shocked to the point it sounded like my cd skipped.

My speaker cables are the same length. And as far as room boundaries, these speakers, and everything else, have been in the same spot for almost 2 years. I used a Blue Sky calibration disc.

40-80hz I'm almost dead even.
500-2.5hz there's a huge difference.

I hope I haven't huffed a tweeter. My local Paradigm dealer quit carrying them a couple of months ago. Any ideas where to get parts? This is a very unwelcome developement.
Thanks again for everyones help.

I've moved them all around, changed channels, changed sources, chnged cables and everytime it's the highs in one speaker. Found a local dealer to get me a replacement, just have to take him an invoice since the dealer I bought them from doesn't sell them anymore. The difference at 50-2.5hz was about 9db. Thanks for all the input.