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problem with USN on only one upstream carrier

Thanks in advance for any help.  I'm having upstream signal-to-noise issues in a particular node.  Here's the situation.  The noise floor is clean and has two upstream carriers.  The carrier at 25 mhz has a usnr of 36db but the carrier at 35 mhz ranges anywhere from 20-25db.  I'm pretty sure it is not plant related and the first amp out has been changed to eliminate any diplex filter issues.  I have good unity (sweep-wise) from the node to the last active.  I'm pretty much positive the problem is either at the node or in the headend.  The x-mitter at the node has also been eliminated as a problem.  This appears to be the only node in the system where this problem is happening.  Also, the usnr #'s are coming from the customer's modems.  Just wondering if any of you guys (or girls) out there come accross an issue like this.....I have a hunch that this is a quick fix and I might be missing something obvious.  Thanks again
This is CABL.com posting #310033. Tiny Link: cabl.co/mbsOH
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