Hi and welcome to the forum here gazkid
Don and I
ask all noobs to please take a few minutes to read our forum stickies about how things work here.
Regarding your question I will leave the leak down results to those more qualified to answer than myself, but I can comment that we have had several owners put 100,000 miles on their 955s.
They are a very robust engine but do require correct and proper scheduled maintenance, do you have a full service history with this bike available?
cheers,
DaveM