i have an error 93,983 i've read the service manual and it refers to a Service Bulletin T7999

does anyone happen to have access to this service bulletin? or any tips?

drum heater failed open circuit (likely the thermal fuse, but i couldn't dismantle the drum to replace it), replaced the drum assembly & now this error has come up - magenta ink is not overfilled in the print head (level looks the same as the others)

please heeelp