McCormack Line Drive TLC-1 Repair or Replace?

Hi All! Newbie here and pretty clueless regarding equipment. I want to fix my Dad’s stereo for his birthday and don’t know what to do. His pre-amp is blown (McCormack Line Drive TLC-1). Should I repair (who? Conrad Johnson is close to me in northern Virginia, or Steve McCormack in CA? Are either of them still doing repairs? Others trustworthy?) or replace? What would you suggest for replacement? He has a McCormack Power Drive DNA-1 amp, Thiel speakers, and Dennon CD player. Thanks in advance for any advice!
Jess