P96 Golf 100 problem with fuel lines on the wings

For a few days I am the owner of aircraft Tecnam P96 Golf 100 (Serial number

71). For the transport I was make dismantle wings. After disassembly I

noticed that the fuel lines are in very poor condition (very many cracks).

Obviously I want to replace the fuel lines for new and here I have a

problem. I do not know how to replace the lines in the wing. In particular,

I can't get up for the return line from the engine. I'm afraid I'll have to

open the wing. Could you explain to me if there is possibility to replace fuel lines in the wing without opening the wings?. If it is possible, then please me tips on how to do it. I expect you will help me solving my problem.

Sorry for my poor English

Adrian