My MP15 has developed a tone issue, and not sure how to pursue a fix. Hoping some of the amp-savvy folks here can point me in the right direction. When I first power the amp up and play, everything sounds great. Nice chimey highs, tight bass response, just what I like. However, once it's warmed up for 15-20 minutes, the tone seems to go really bassy/boomy. To my ears at least, not so much that it loses top end, but the bass frequencies get overwhelming. Seems particularly noticeable when I'm playing my LP (ish) with humbuckers. My first thought is maybe theres a cap in the tone circuit thats failing as things get warmer, causing the passed frequencies to go wonky. I know I've seen a schematic for (I believe) the Laney version and thought I'd saved it, but can't find it now. Just looking for any ideas or advice from folks I trust! Thanks in advance for any input.