I've had my REV2 since 2017 and never anything clear came out of that synth...
yeah, I have serial number 32 -- I've noticed the clear viscous fluid and kinda ignored it because it wasn't causing any issues -- usually when I have the synth propped up standing up on its side, I'll see it running down the bottom of the synth chassis. If it's some oil, I'd imagine it would be pretty harmless to electronics -- I'll snap a picture the next time I'm moving the rev2 around from location to location.