My friend with a mecbook pro retina mid 2014 like mine, asked me if he need a new power adapter but I’m not sure about this, I’m a developer not a technician. He told me that the cable isolation is damnaged near the magsafe 2 connector and to fix this he used the electric isolation tape. He’s worried about problems that this can cause to the laptop. Is there any risk to damange the laptop and he need really to buy a new power adapter?