Anyone Have Experience w/ Buzz-In Intercom Systems? Maint. Costs?

[Radley Estrada]

Hey Everyone,

I purchased a 4-plex apartment that came with an Aiphone GF-1D buzz-in intercom system.  The system works well, but, is fairly old.

Any members out there have experience with buzz-in intercom systems? Cost to maintain, repair, and/or replace?  Who would you call (electrician, handyman) to repair?

Thanks in advance everyone!