Technician to review my Marantz Monos

Can anyone recommend a Technician to review my Marantz Mono MA9S2 mono amps electronics? Someone mature enough to recommend upgrades along the way? In the USA.

Ae28a028 56db 4738 a384 886a0cd1c3e0johnread57
Recommend you contact Jennifer at Jena Labs. She has performed very effective modifications of Marantz MA9SA2 Mono Amps.
Best of luck in your quest.
Audioesq thanks. I contacted Jennifer and they no longer do this work due to business growth.

I have found someone else.