1. Don't panic .... Bo105 and Bk117 Hyd systems run @ 100Bar (1500 psi) if you have a Hyd leak you will know all about it ...quickly! Having said that it is somthing that is
ALMOST unheard of ?? ( though I'm sure someone will correct me!).
2. You most likely have a "weep" from (as suggested earlier) the hydraulic pump drive seal at the transmission to hyd pump drive. This is NOT dangerous and is easy to fix. Transmission oil is used to lubricate the drive splines. Sometimes the seals weep (or in cold Wx harden so as to not do their job properly.
3. Find a suitably rated mechanic,.... bribe him with the threat of much beer AFTER he fixes seal ...... problem fixed!
Cheers
