Air line repair/replace for lumbar seats on w220


My 2000 s500 has broken airlines running to rear seats lumbar control and into the cushion. Does anybody know procedure or where to purchase replacement parts to fix all pse air lines associated with lumbar controls. And also I can turn lumbar off and all features work, soft close, door lock/unlocking etc. But when I close trunk it will pop pse fuse again. Do I need to replace trunk soft close actuator as well the air lines seem fine going to it