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 28 (click to view)
4-3. PRINTED WIRING BOARDS
Link
VC-520 BOARD (SIDE A) VC-520 BOARD (SIDE B)