As an update - RDS replaced the the front output shaft seal and flange on the transfer case - after driving another almost 750 miles it appears to be fixed! RDS also took care of my 12k mile service during this visit (totaled around $750 - oil + filter change, new wiper blades, diff fluids replaced, tire rotation, HVAC filter change), as well as a few other issues - the door lock switch on the inside of the drivers door was broken (grateful that they replaced the part from a stock grenadier, as they didn't have a replacement part in stock) and also had them try to remove the NATO socket cover (no success here - I might try to get MileOne to replace the NATO socket on my grenadier under warranty, because it's impossible to remove the cover). Also, lastly, the oil leak on the starter/transmission block - it was confirmed that the oil was residual leak from the previous oil change (around 6,000 miles) and just ran down to that area - so good news is that the seal was not leaking there!