upstream channel bonding

I have a Nighthawk CM3000 but my upstream ATDMA channels 5-8 are not bonding and OFDMA upstream channel 2 is not locking. Downstream signal is perfect — power levels 5-6 dBmV, SNR 42-43 dB, zero uncorrectables. 

One thing worth noting — OFDM correctable errors aee 119-161 million. Uncorrectables are still zero.

I already have a ticket open and a tech appointment for May 2nd. But after an AI assisted analysis it's seems likely there may be a MoCA/POE filter that may be blocking upstream channels.

I’m in a multi-unit building. The tech should  trace the line from my unit’s tap back to the distribution point and check for filters or signal issues on the return path. 

If there are any xfinity employees online, is there a way to get this information added to my ticket/appointment notes to save some time for the tech?