Anyone has a service manual for a Siemens HC744233U?

Anyone has a service manual for a Siemens HC744233U? ​Our Siemens HC744233U electric stove has never worked properly! The IR cooking burners has never been putting out the expected heat. Even at full power they are never heating continuously - and even simple cooking lacks heat. (Not quite sure if they are “fixing” some thermal design errors or it has indeed always been defective)