Here is an excellent publication titled Nam June Paik Pre Bell Man: Eine Ikone der Medienkunst that features the conservation and restoration of a multimedia installation Pre Bell Man by Nam June Paik at the Museum für Kommunikation Frankfurt. It emerged from critical debates surrounding the issues of returning this canonical work to life in which I participated amongst many brilliant colleagues and speakers, Wulf Herzogenrtah, Bernhard Serexhe, Helmut Gold, Franziska Stöhr, and others. The book involves very short excerpts from the symposium, curator’s and restorer’s accounts, and beautiful illustrations of the conservation/restoration works conducted on Pre Bell Man. The symposium webpage is accessible here.