Rotronics battery Management Systems

I have a three stage Rotronics Battery Management system in my 2004 79 series LC.
I understand that these are no longer manufactured nor are they repairable.
Before I replace this system with say a Redarc I wonder if any of our knowledgeable EO
members know of anyone in Sydney or surrounds who knows anything about Rotronics gear.
I am told by a former supplier of Rotronics in Qld that they seldom fail but the problem could lie elsewhere & the fail safe system built in could prevent the system working if it detects a fault elsewhere
Of the Auto Electricians I have spoken to most have never heard of Rotronics & lean towards
replacement
I have so much gear running off my batteries that a major rewire would cost several Thou.
Will bight the bullet if necessary but hope to avoid it if I can find somebody who can diagnose the problem
Ross Nielsen