12 stop building. Having trouble finding cause of DAR fault. Fault code 48, 10 and 12. Happens in floor zone only and at floors that have more than 1 mag input to selector. Runs to 1, 2, 4 and 8 without issue.(only 1 mag input per floor). All other floors have 3 mag inputs to selector. For example floor 1 only has R1 input and will run to floor 2 that only has R2 input without issue every time. but floor 3 has OP, R1 and R2 input and faults every time just before it stops at floor. The car volosity on the group monitor shows it slowing down to about 20 fpm, than spikes to about 220 fpm and gives DAR fault... ANY help will help Thanks

Try swapping OP odd parity input with R2 and see if floors are affected differently. Check that micro fuses are tight on input OP.

Thanks, I'll try later today

Found another selector board, replaced it and problem solved. Going to have original selector board repaired for back up. 😎👍