This is exactly what I needed This was a hard one to find and I had already downloaded several for other Panasonic radios but none matched my radio.
Although my radio is the LBE model the LBS is the same.
A very good quality manual with every thing you should get in it
Text excerpt from page 1 (click to view)
TX-28/25/21MD3P Service Manual
Safety Specifications Parts List Service Information Adjustments Self Check Service Hints Mechanical View Disassembly Location of Controls Waveforms PCB Views Schematic Diagrams Block Diagrams
Service Support Service and repair of this product is supported by Panasonic's LUCI interface. This interface provides a link between the TV and a standard PC to allow a number of diagnostic and control functions to be performed. For more details contact your local Panasonic company.