Is it possible to replace MCU ?
blown temp sensor. temp sensor SDA SCL 100.. 700ohm . seems all 3 card ID ports are 5..7ohm
What is it?
My guess from picture is ATmega.
For the question I'd say that hardly.
Manufacturer can of course give you a filled one, or sell for nominal fee since you're so good customer.
It's a 8051 with internal program
Guess that you cant buy a spare from HP
There are loads of counterfeits on the marked of these modules
intel N87C521
some made front panels
could be possible to read serial and make on something like 328