I inherited the support of a i28 system and need help finding a manual for system (not handset) programming. The company had a past bad experience with our local NEC dealer and refuses to have anything to do with them and would like me to resolve the problem. I am fine with programming, and think I found the access code to get into the system from a set from another message, but understand that it is useless without a manual. There is also a DMI-U port of the KSU that may connect up to a PC, but I do not have access to the proprietary software, which I understand is flaky as well, but at least I could download and/or document current settings. Any help, direction or suggestions would be greatly appreciated.