Usually the lights refer to an empty ink cartidge or a paper jam.
These can be easily mopped up by checking out the advise in the user manual or by applying a bit of common sense.
However, most printer manufacturers will have some vague error messages that tell you to call an Engineer or have it Serviced.
We service many Printers and most of the time if it isn't a serious problem at all, all inkjet printer have a waste ink tank and they all keep a record of the number of pages that have been printed.
If you do a Google search for the following free program SSC Service Utility, you will find a host of useful little tricks, such as resetting page counters and resetting the waste ink trap warnings.
We find that most printers will give many more months of useful service before you need to have it physically serviced and it usually isn't worth it as most Printer Manufacturers don't provide spares for cheaper printers.
If you need any futher help then feel free to call us or visit our web site, Highridge Computers Shop