Linn 5140 aktiv cards in an LK100/140

Greetings,
I have a 5140 Aktiv system using (3) 5105 amps. I lost a channel on one amp for the 2nd time now and was wondering if the aktiv cards will work in a LK 100 or LK 140 amp? I have an LK 100 that has ran flawlessly for 10+ years and want to use it as a back up while the 5105 is getting repaired. Depending on the sound, I may want to keep it as the treble amp in the system. Also, any idea of a good audio repair shop to repair this amp in the Phoenix area?

THanks