Hi guys

first time posting in is this forum so any help would be appreciated

I currently have a Sharp MX-M503N and it has always been running great until today. I get a weird clicking noise and a code after 2 or 3 min displaying F2-64. Iv'e checked the service manual and I have done 2 of 6 remedies, but still same issue. I just need someone to pinpoint where exactly i could find this remedies the service manual is talking about?

need to find!!
- toner clutch.
- toner density sensor.
- Connector and harness check.
- PCU PWB.