Hmmm, can't believe there aren't any takers yet!!!
The C+, ok machine I guess, still a 76 afterall. 2S1 engines, lots of jam, much more so than A or A+ (maybe A++ too?).
No. 1 weak link IMHO though is the DECU (Digital Engine Control Unit). Reason - Single Channel Digital Engine Control with good old fashioned cable backup for manual control, if required. This component is very capable of generating NO END of faults, most of which are minor in nature and pose more of an inconvenience than a genuine mechanical problem. Trouble is, even being an inconvenience means you need to call an engineer to clear the fault before you can go flying again. It can be a right royal pain in arse.
No. 2 weak spot is engine power assurance procedure and results of same. While things have gotten better from where they used to be, power margins can at times be right on the line. Assuming the on board calculation system fails to give a valid check, you are left with going to the chart and that can sometimes be entertaining. It's best if you make sure your pencil is not TOO sharp.
My two cents.