Actually I am
trying to think of anything I own and depend on (or
 even use actively) that I am not capable of repairing.... 
 Your PC's harddisk,
 
Tony doesn't have a "PC" (he's stated this often enough that even I
have managed to remeber it - even if I've misremembered, I'm quite sure
he does not "depend on" one) and quite likely does not have, and surely
does not depend on, a modern "harddisk" - by which I mean one with
effectively unrepairable electronics (by heavy dependence on
undocumented ASICs) and a sealed and approximately unrepairable
head/platter assembly.
  Also the same is true for the computer CPU's.
Not for most (all, probably, given his statement) of Tony's machines.
  You do not want a FIB machine so you had a chance to
repair the IC
 itself. 
This too is quite likely not true of Tony, I would hazard a guess -
possibly excepting reasons of physical space.
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