I have searched and searched (bike and forum) for more details on this, and I can't for the life of me find this. The waterneck on my E has two equal sized bolts which don't appear to be a drain bolts, but just a fastener types. if anyone has a pic or can point me to a fiche drawing of this, that would help.

i ended up just bleeding using the top one, hopefully it will be ok.

while doing the flush / change, my vapor temp sensor started giving me ridiculous readings (760 celius and above!)....any one ever get this?