Serial Number ironically is 0011234. The box didnt survive the move back but the receiver looks to be basically untouched, or obviously gently used for the age & the fact that it has been untouched for probably 10+ years.
Marantz Receiver Manual. For Model 4230 Quad 4 stereo 2.
To ensure a proper restoration, it is imperative to replace all electrolytic capacitors on every board. It's akin to replacing one tire on a car while keeping the rest worn-out. A complete rebuild necessitates a full recap of all PCBs.