So this means shipping the whole speaker when you have a ribbon problem?
Bass panels - installer only. Other ribbons - you should be able to do yourself. But I would advise against it. Especially complex Scintilla type arrangements.
Bass panels turned out to be too skilled a job. People think they can do it but there were so many screw ups it HAD to stop. There are some YouTube videos showing how to do it and you don't want to go there. It isn't trivial for the majority. The bigger the model, the harder it will be. Also, you might think the ribbons are a problem when in fact they are not.
See here: http://www.apogeeacoustics.com/repairsapogeeribbons.html