1990 Teco 65' bucket truck issue

[PetersonB]

I have a 1990 GMC bucket truck with a 65' Teco lift. Yesterday I blew 3 low pressure hydraulic lines almost the same time. Looks like the same line in different area's on my boom. I was stuck 40' in the air for 2 hours before able to work it down. The lines look just like semi air lines. Anybody have any idea is to where I start looking. I fixed all lines but did same thing over again.

 

[PetersonB]

Ive also been trying to find a hydraulic diagram manual for this Teco,without any luck either.