Have a Smartrise C4 traction duplex. 8 stops. Slave car is currently down awaiting parts & now master won’t take hall calls on the intermediate floors (2-7) but all on floor 1&8. All hall boards show 100% comms, no faults, SRU board display shows normal. Verified all wiring, dip switch settings on hall boards & riser board & SRU board. Waited over 4 hours for SR to call but they never did. Looking for ideas. Thanks