This could encompass a few different things and how is it running?
Depending on how many years the engine has on it a complete rubber hose change (fuel, oil and coolant).
Carb rebuild.
Gearbox inspection at 1000 hrs or should have been done at 600 hrs with the use of 100LL more than 30% of the time.(Your 912ULS may or may not have a slipper clutch)
Prop inspection.
Pull the oil tank and clean it.
Then a really good annual inspection.
Have you been doing oil analysis at each annual?
Roger Lee LSRM-A & Rotax Instructor & Rotax IRC Tucson, AZ Ryan Airfield (KRYN) 520-349-7056 Cell
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