TDA7294 amplifier lower volume on left channel

Hello All!

I'm playing around with this TDA7294 amplifier board:

https://www.pcbway.com/project/shar..._Amplifier_with_bass_and_treble_499c51bf.html

I've completed the board and hooked it up for testing. It works, but I notice a lower output volume on the left channel compared to the right. It's not a huge variation but noticeable. My electronics knowledge is limited so can anyone suggest what might be causing the difference and what I should try to fix it? Also, is there an easy way to determine the power ratings on the SKP0228 transformer? It puts out 24-0-24. I can't find any information online. Thanks so much!
 

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