Touch your amplifier chip and feel for warmth. If it's very hot, you may have a problem. If not, it's probably nothing to worry about.

One more thing to look at, but please do this with power off. Check the polarity of the capacitors. Make absolutely certain they are connected properly. An electrolytic capacitor connected backwards can explode, sending electrolyte and metal shreds everywhere. It could easily blind you if you were struck by shrapnel.