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1 of the 2 MBOX TRS outputs is weaker all of a sudden?

i have a simple pro tools 6.9 / mbox / powerbook g4 rig with powered krk speakers. randomly today i noticed the right channel was significantly softer than usual. i got a signal, just super soft. one of my TRS outputs (line output 2) was like 70% weaker than my other output. it's not the speakers or the cords, because i tested them all through line output 1 and it worked fine.