M-audio Fast Track Pro broken: No sound from left TRS output

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Hi all!

My fast track pro is a couple of years old now (bought in 2012 i believe) and since a couple of days the speaker hooked up to my left TRS input experiences a problem:

Whenever i play audio, the speaker hooked up to the left TRS output plays sound normally for a couple of seconds before slowly decaying in volume and eventually not producing any sound at all unless volume setting are set to maximum.

Anyone know how i can fix this (and yes, im a rookie)?
 
Thanks!

Yes, and it is definitely the sound card. I systematically double checked both the power cabels of both my speakers as well as the TRS cables and they are all not the problem. Yet when i switched the two cables around (so putting the right-hand speaker in the left input and vice versa) the right-hand speaker did the same thing.
 
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