TSGL: Mobile phone - hope someone can help with this

[Computerfee]

Hi there everybody,
My husband is trying at last to repair the old mobile phone of our son which is a Siemens SX1. We found online, the solution for the problems seems to be a cold solder joint of the Flash Memory on the printed circuit board which you have to re-do. Now the problem is our lack of knowledge where to find the point where it has to be done. The description of the repair is rather vague - wrap plastic-part of two plug-connections with aluminium foil, put some solder on the edge of the printed circuit board and heat it up with a hair drier until it gets liquid. Well, nice clear - the edge of the thing could be anywhere. here is a link to the photo of the printed circuit board in question it is part of a description for changing LED colours, so that's why these spots are marked - http://www.blue-backlight.de/de/umba...umb_sx1_11.jpg Maybe it is not on this side even but on the back of it, but I could not find anything else but the description above and the forum where I found it, seems to be quite old, as the mobile is quite old as well. 

So I am just hoping anybody around does have an idea that could help us here.
Thanks a lot
Best wishes 
Heidi