1991 asplundh bucket truck

[MAVERICK43]

I just bought this 91 asplundh bucket truck there some kind of valve leaking right below the pistol grip on the bucket not sure what it is..can some one help me with this?? And maybe recomend a good place online to get parts for this truck..

 

[jmfe]

Check all o rings ect, And safeties are secure: