You're asking for information about a "Marantz 112 Service Manual" related to a vehicle. However, there's no known vehicle called "Marantz 112". It's highly likely that "Marantz 112" refers to an audio component, possibly a receiver or amplifier, produced by the company Marantz.

Marantz is a renowned Japanese electronics manufacturer specializing in high-quality audio equipment. The "Marantz 112" service manual, most likely, provides detailed technical information and repair instructions for a specific audio component bearing that model number. This manual would be a valuable resource for technicians, repair shops, or even dedicated audio enthusiasts who are familiar with electronics and capable of handling delicate repairs. It might contain schematics, parts lists, troubleshooting guides, and detailed instructions for various maintenance and repair procedures. While not available for general purchase, this manual is usually accessible through online marketplaces or specialized electronics repair communities.