I-trigue 3400 soundwoofer not working / right speaker low output compare with left speaker

Hi, basically i have 3 sets of creative i-trigue 3400 purchase as second hand. All these 3 sets have some minor problem. I trust my ability i able to repair it as iam a professional electronic engineer. Just need some advance information or guidance from creative big brother and sister.
i do check with the controller everything, because i have 3 sets so i able to verified the problem.
1)subwoofer not output----Is it problem with amplifier or any transistor damage? How do i start checking and verified it?
2)right speaker low output compare with left speaker----I already analysis it and would like to know is it the transistor prolem? Please let me know so i can start with my repairing.
From what i know, this model seem like going to discord soon, so is it possible send me a partial schematic on the 3400 so i can repair. Please let me know and reply me, i am waiting your answer. Thank you

seem like nobody reply my email, can creative technical provide some guide. I already mention i will repair myself.:angry:

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