IT is a Stromberg Carlson 1A2 Key Service
584 C Panels The first line rings in and lights
when you push button light goes out. But you can put in on hold but no lights.. Second line rings, no lights check line nolight can also put on hold.. 3 & 4 ring in with lights push button no lights.. all lines can be put on hold..
Check all fuses replaced bad ones 4 ..Interrupter runs... I have 2 extra panels in cabnet but do not know if OK.. This is a very old box??? Comdial sets 30 btn..