any experience with TRL mod ?

Check the archives both here and at www.audioasylum.com in the Hi-Rez Asylum. You'll want to search for "TRL". You should get all the info you seek.

If you want to hear my praises of TRL and their wonderful digital mods, feel free to e-mail me direct, jack_seaton@yahoo.com

So far they have modified a Sony 775, a Sony 595, a Sony C2000ES (best so far by a margin), a Sony VPH 1272 Data Grade CRT projector, and an NEC IDC -3000 line scaler for me. I'm not done yet, they'll see other units of mine within the next few weeks.

Best wishes,
Jack

There's a new TRL 595 review at the following link, which might answer a few of your questions.

http://6moons.com/audioreviews/trl/595.html