HP25C repair, help needed

[albertofenini]

One last thing,
we have left the unit with the battery connected and turned on,
after a while we have discovered the the two transistors in the PSU and the two capacitors
where very hot.
Pictured on the right is a also an HP25 board from which I have already scraped some spare parts.
Question is : how confidently can we transplant the two transistors from the HP25 to the HP25C ?
Why is on the HP25 present only a large capacitor (gray) and on the HP25 there are two ?
Can we sort of replace them ?
Anyone knows values for the PSU components specifically for the HP25C ?
Thanks a lot !!