Yesterday I replaced an ACS R3.0. The problem with the old one was that when trying to access either a line (pushing line keys)or intercom (pushing ITCM key)--I just gave out a low static noise. We reset the system (customer only had one module--the 308 ACS) several times. Light on system always came on and the 4 phones would respond to F00 and Ex 10 would respond to System Programming---however the ITCM & Line Keys just would not work. We replaced the KSU and everything worked normal--including the VM. Any ideas as to repairing the module in our shop?---or--who can we send it to and what would be the costs.