failure

Hey guys, I inherited this 372 X-torq with a broken piston. A chunk of the skirt on the exhaust side was broken off and there were metal shaving in the exhaust. The cylinder was badly scored. I went ahead and replaced the piston and cylinder with OEM parts. I broke in the new top end properly...

Was running a new (used) bucket truck today. It started leaking hydraulic oil near the lower controls. Not sure if it was from a fitting or the line. Questions: It was in the low 20's, do these temps contribute to hose failure? If they need to replace the line, should I have them all...