Another month, another update...and this one is pretty interesting.
TL;DR - DSG got replaced 2 weeks after a TCU tune.
So I flashed my car to 034 Stage 2 ECU around mid-December. At the time there was not a TCU tune from 034 for my TCU boxcode. So I ran the car for roughly a month with no TCU tune while waiting on 034 to develop one (ended up needing an extraction cable from 034 to pull the specific info), but finally flashed the 034 TCU tune mid-January. Two and a half weeks later, I encountered a strange error when driving the car. If I was giving it more than say 15% throttle, instead of shifting from 1st to 2nd, the car would act like it was getting thrown into neutral and would rev high like it was in neutral. A message in the dash MFD would appear saying "push brake to select gear". I put on my hazards and let the car coast a bit and the transmission would re-engage. I thought it was a random glitch and ignored it. But then it started doing it every single time I drove the car, to the point where I stalled in intersections and had to reverse out because the light had turned red.
I flashed the car to stock TCU tune, and the fault still occurred. Flashed the car to stock ECU tune, still occurred. Performed a DSG adaptation, still occurred. At this point my only hope was to take it to the dealer since 034 had no experience with this fault as they had never heard of it. Took it into the dealer and the next day, the service advisor & tech diagnosed it as slipping clutch packs (car has 13,4XX miles on it). VW instructed the dealer to install a brand new DSG under warranty (phew). I was pretty relieved to hear about the warranty part, because all said and done it was close to probably $9,000 to replace it.
I've had a Mk6 GTI in the past and experienced a slipping clutch, but never experienced one in a DSG. It's possible that clutches could've been failing, but without a failure analysis which I'm sure I'll never see, I'll never know. A part of me also thinks that it could've been the 034 TCU tune that could've caused the failure or maybe was the tipping point? I never launched the car when it was tuned, and the only aggressive driving I did was relegated to highway and on-ramp pulls. Needless to say, I'm no longer confident in using 034 for software (hardware is great and among the best IMO). So my downpipe will be coming off and will be up for sale, and I'll be switch to a Neuspeed Power Module or JB1 for the foreseeable future. I still don't feel entirely confident driving the car, but I guess we'll see how she goes down the road.