Audison LRx5.1k distorted sub channel

Hi guys,

I have this audison LRx5.1k with a distorted sub channel. I've been racking my brain for a week trying to figure it out. This amp originally had a blown sub channel. Luckily I have original cards I replace the sub channel card and the drive card and now I get a distorted output that causes the amp to go into protect. Please help! Lmk if u ever had this issue.
 

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