18year old bosch dishwasher model smu7056/us/09, won't fill?

18 year old bosch dishwasher, won't fill on its own, all cycles work when manually filled with water, filter clean, water pressure good, is it a valve issue and or main control? where do i get a flow chart for troubleshooting, and buy replacement parts? here are all of the numbers ----E-NRsmu705 6 us/09.

FD7212 004 810,
s5e56b.
0730-200-037, any help would be great!