My snake is also doing the same.. however she shed about 3 weeks ago and this started about a week ago. After the 2nd day of hearing it (also not seeing any mucus or bubbles anywhere) I took her in anyways.

The Vet also looked in her mouth and just said she looked to have a little more saliva then usual. We agreed to do a type of culture where she shoots some saline solution down into her lungs (from the mouth), then gives it a second and sucks the solution back up. Then she puts it into a petri dish, adds something that if a virus is detected it would continue to grow by itself in the dish. Usual signs are shown of growing in 24 hrs.

After the 1st day, nothing grew. Called back yesterday (2nd day) and still nothing. She said usually if nothing shows up after 48 hrs, it usually doesn't grow, so no virus. She said to monitor her and see if anything gets worse. (mind you she still has the noises going on when I hold her up to my ear, and you can almost feel them in her body everytime it happens also). The Vet felt/heard the same thing when I took her in, and also said a tiny bit of mucus came up after retrieving the saline.

Her eating habbits havent changed, tongue is still flicking, and is still as active as normal. So my feeling is hopefully it was poss the beginning of an R.I. but really hasn't gotten bad and hopefully will just take its course. I will keep you updated on if the Vet ends up seeing anything grow by Monday.

My opinion is to wait it out and make sure you don't see anything visible as far as the mucus goes. I know these things can take their course if they aren't too sever (that's if it is the beginning of an R.I. and not just shed). Good luck and keep us updated! I hope I eased your mind a little.. By the way, it will save you a little money also, to take her in and get the culture it was almost $170.00. Don't get me wrong I would spend whatever it takes to keep my animals healthy, but if it isn't anything to be too concerned about yet, it may run its course and you might not be out of your pocket as much also Good Luck!