Here is the front panel connections I found via trial and error:
MILK-V_PIONEER_V1.3
CPU Fan
Case Fan
Front panel connector
x 9
8 7
6 5
4 3
2 1
Power switch: 8 - 6
Reset switch: 7 - 5 (hold to reset)
Power LED: 4 (-) - 2 (+)
I did not try the HDD LED yet, as I don’t get my board to boot at all - probably due to incompatible memory, other memory on its way ^^