No news to report as of yet. Due to the COVID-19 crisis, Krell has shut down operations at their service center as of late March.
Before that occurred, the Krell engineer(s) suggested that it could be the preamp that was causing the problem. I did some basic testing on my own to try and determine if there was any significant DC offset in the signal path from the preamp. My readings indicated less than .5 mV on either channel, which is well below the threshold for what is typically considered unacceptable. I have since taken the preamp in question to a local electronics serviceman to put the unit under a more stringent evaluation. In discussing the amplifier issue with him, and based on his experience, it's not likely that the preamp is the culprit. Possible, but not likely.
Overall, and as you can see from this thread, there have been a lack of owners chiming in with similar problems to the ones I've experienced with the iBias line of amplifiers. This is certainly encouraging.
My experience with Krell audio equipment is certainly not to the level that many on this forum enjoy as this is only the second Krell amp I've owned. However, my enjoyment of this particular amp has exceeded every other piece I've owned. The synergy in my system with the Krell providing the power suits my taste quite well. Whether or not the Krell TRIO that you're eyeing will do the same for you is, of course, not for me to say. But I would certainly give strong consideration to making the purchase or at least requesting an in-home audition.
I wish I could be more help at this time. I'll likely follow up on this thread once the amp finds its way back to me. In the meantime, it's being greatly missed.