Fuel Soaked Servos Are Bad OK
Marajuana is Bad!!!! OK

Looks like the designers put the servos in the tail for easy/simple
control linkage installation & balance Or they just took the easy
way out and stuck them back there for lack of a better idea?
They did not plan for the long term effects of Real World Flying,
like grease, oil & dirt getting into your servos!!!
I first saw this problem on the Goldberg 300S Profile & the OK
Models Seduction FunFly Profile Plane. Having a Morris Profile Hots
I know first hand how much oil & dirt gets all over the lower rear
fuse,stab, tailwheel, & rudder while hovering and doing 3D stuff.
My friend Paul has a U Can Do 3-D with a YS .91 and he is having
servo centering problems with a new JR 4131 servo on rudder.
This could be caused by wet electronics.
"WARNING SIGN PAUL"

Solutions:
Sell airplane and buy a Morris Profile; just kidding
Move servos up front and use a Pull-Pull linkage like Morris does!
Make an exhaust deflector out of metal or wood to protect servos,
these could be painted or Monokoted to match plane.
Buy waterproof servos " expensive & not 100% guaranteed"
Seal servo cases with silicone rubber " be careful some silicone
attacks electronics " This info from Pete Waters of Kraft Midwest!
Not recomended & will void radio warranty
Put a small Sig canopy over servo to protect servo & cut a slot for linkage or just
cover the front half only; kinda like the side bubble windows on a
WWII PBY seaplane, you could either glue or screw canopys on.
Buy lots of servos and replace every 4-6 flights
Convert plane to Electric? Yea Right!!!!!!!!!!!
Try turning the muffler so it points up & blows the exhaust on top
of the wing and tail away from the servos.
Don't Worry Be Happy!!!

Good Luck & Hope this helps

Bob