when i opened it i found a manual like new
It looks very clean - excellent!
The printed circuit board that is top leaft Is the main computer board (MPU) and in the centre at the bottom of that board is a blue battery pack - this has obviously been replaced from the original but even so, do yourself a favor and cut it off right now and bin it - the repairs and the reason will become obvious to you in time.
Well done - it certainly looks like a 'repairer' to me.
