Replacing bulb's in Presonus Eureka channel strip

[Diamondj421]

I just got a Presonus Eureka channel strip back from a buddy with intentions of selling it but the bulbs in the VU meter are burnt out. There are 3 small incandescent bulbs on the PCB but despite my efforts, I can't seem to find a part number or a schematic. Is it possible to measure a bulb with a DMM if the filament is messed up. I was thinking about possibly replacing the bulbs with LEDs if I can't find direct replacements. I'm pretty sure I can't just drop LED bulbs in and go about my day though. Can anyone help shed some light (No pun intended)?