My mother has a Modena 80E Gas Boiler with no manual, can you help?

My mother has a Modena 80E Gas Boiler with no manual, can you help?

It appears that the last time she had a gas fitter in the house he had never seen that type of boiler before and unfortunately when he went it appears that the manual went with him as it has never been seen since. As we are having problems with the boiler at the moment we need to obtain a new manual.