Rebuilding a project game solenoid board and was checking transistors including the pre-drivers in the CA3081 transistor array.
Beside using the game schematic I couldn't find a ready resource for which pre-drive transistor corresponded to which drive transistor so I created a table. This way you can easily double check either the entire array or if you have an issue with one solenoid.
Meter on diode setting. Red lead on Base. Black lead separately on Emitter or Collector. Reading should be around 0.6-0.74 ish
Hope you find it useful.
Also included a pinout for CA3081 if you want to use a 2n4401 transistor to patch around one pre-drive circuit by cutting off chip legs (credit to barakandl)