Join or Insomnia.gr (the "Cinema" section). Post a request: "Ψάχνω ελληνικούς υπότιτλους για τη σερβική ταινία [Name]. Έχει κανείς;»" The Greek Balkan cinema community is small but very helpful.
A Greek film subtitler discovers that the bootleg Serbian horror film she’s translating contains a hidden curse—one that rewrites reality with every line she types. serbian film greek subs
The Uncut Nightmare: Why You Need the Right Subtitles for Serbian Film (Greek Subs Edition) Join or Insomnia