what model yanmar do I have?

Have been in the market for a mini excavator for a short while. Found a yanmar with new paint and stickers said B3 at auction. Paint is right over the rust and all. Has just under 3000 hours. Can not find any label plate besides the one one the engine.
Model: 3TN78L-RB
23 HP
Displacement 1.232 l
Engine # 02265

Found a stamp on main arm TN 23

Any help?

Want to go thru it and get it right for work, but need a model and year to order parts.