Defect Symptom Error 31.25 – Capacitive Toner Level Sensing (CTLS) Calibration capacitor reading is too low. Possible issue exists with the CTLS circuit.
Customer Repair Action & Troubleshooting 
Remove and re-install the Imaging Unit; ensure that it is seated properly.
Repair Sequence 1 (Copy into Siebel)Try swapping Imaging Units if possible.
Parts repair 1 N/A
Repair sequence 2 (Copy into Siebel)Replace Controller Board.
Parts repair 2 40X8025 – Controller Board MS310d - DO NOT recommend for first repair call 40X9656 – Controller Board MS312dn 40X9657 – Controller Board MS315dn, MS415dn 40X8026 – Controller Board MS310dn 40X8027 – Controller Board MS410d - DO NOT recommend for first repair call 40X8028 – Controller Board MS410dn 40X8029 – Controller Board MS510dn 40X8030 – Controller Board MS610dn 40X8388 – Controller Board MS610de 40X9251 – Controller Board MX310 40X9252 – Controller Board MX410 40X9253 – Controller Board MX51x 40X9254 – Controller Board MX61x
LEGACY ID: SO7333