Yikes.? You have some really bad stuff going on in the receive path.
T401 would be the likely culprit, but you checked that.? Make sure each of the leads really has the enamel cleared off.
Also check L401 - all receive signal goes through it and the related capacitors, so check those carefully.
Did the behavior change with the replaced PCM1804?? If not, it may not be the issue.? I had a PCM1804 that made horrible noise when it was cold, and was fine when it warmed up.? Replaced it and all was well.
Good luck.
