what model gazelle do you have ?
is it civvy or mil?
french or made under licence ?
registry of helicopter ?
it also depends on what your aviation authoritys rules are
your quote SA341G approx. 800 h remain on turbine (Astazou IIIB) could be a bit missleading as a 341g should have a astazou 111a engine anyway according to the type data certificate for the 341g if its a 341h hera it should have a 111b engine
but if its a 111b engine moma in yugo are still supporting it and they do very cheap overhauls as long as you caa will exept it