I have an RV-7 at MQJ outside Indianapolis. I need brake for done (I believe the O-ring is shot). Am I correct that I would not need an A&P to do this? I am not savvy enough to do it but, I assume, anyone (i.e. a local RV builder or owner) could assist me in doing or does it need a sign off? Not as familiar with experimental side. I would like it done ASAP so trying to figure my options. Thanks!