It's been ages since I've posted in here but this one caught my eye. Not too long ago, my four year old cream corn had a RI so I thought. To this date I'm still not sure. He was doing all the things your corn was doing. Ate great, acted fine, no discharge from the nose or mouth. But the noise it made while breathing was really concerning me. I did a lot of research online and found out where they where someone had used grapefruit seed extract to treat respiratory infections using a nebulizer. And somewhere where else where nebulizers had been used to treat reptiles with breathing problems. HUMMMM idea!!! I happened to have a nebulizer at home because my daughter suffered from bronchitis when she was a baby. So I hooked up a sterilite container that already had small holes punched in it and hooked the breathing tube to it and gave my snake breahthing treatements nightly for about two weeks with the grapefruit seed extract in saline solution (and I did turn up the heat in his cage to about 90). It actually seemed to help, his wheezing was considerably reduced and well it didn't seem to hurt him a bit. Then the snake shed. And then ALL his symptoms disappeared.....
SO did he have a real Respiratory infection or was his shed blocking his nose enough to make that darned wheezing noise!?! I'll never know. Just food for thought and but I would love to know if the GSE really did work. Maybe yours too is about to shed and if in doubt take him to the vet. I don't suggest trying my idea becuase it's NOT a proven treatment. I would just like to say for the record that if he would have shown any signs of getting worse I would have taken him straight to the vet, but personally I'm really bad about going the holistic approch before going to doctors.
Chantel

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Chantel a.k.a. sillygirl
"I came, I saw, I adopted"
2.2 green anoles (Stumpy (M)), and the rest remain nameless.
1.1 green tree frogs (Romeo & Juliet)
1.2 Firebelly toads
0.0.5 D. tinctorius (Cobalt froglets)
0.1 Anerythristic 'B' (Charcoal)corn snake (Popcorn)
0.1 Snow Corn (KandyKorn)
0.2 Amel Corns (KornSilk & KornMuffin)
0.1 Normal Corn (PepperKorn)
1.0 Creamsicle Corn (Kream)
0.0.1 Giant African Millipede
2.4 Domestic house cats (Bad Boy (m), Bart(m),Sasha(F),Little Bit(F),Spirit(F)
1.0 Rottweiler (Jake)
2.5 Rats (Mouse, Socks, Silver, Squishy, Fox, Lucky and B**CH)
1.3 Mice (My step-daughter seems to think they are pets)
2.0 Betta (Sushi, Blue)
1.0 Husband (David, who loves all my critters too)