HP 510 - Manual (Page 182)

Logs
Your printer keeps a printhead log and an error log. These logs are normally used by service engineers.
Printhead log
The printhead log contains a list of the last five printheads of each color with information about the usage of each
printhead.
Error log
Lists the last errors that the printer has detected with the date the error occurred and a unique error code for the
type of error detected.