Oh pur-leeese....
Serious? Grow up. Structural failures are serious, the loss of a hydraulic pump (more correctly, a Secondary Power Unit according to my guy) is not. That's why aircraft have redundant systems, is it not...???
Serious is the top of the fuselage departing the rest of the aircraft, or reversers deploying in flight, or engines departing the airframe.
Regarding the instrument failure, I wasn't commenting on that, but in any case I find it hard to believe the standby ASI "wound down to zero"- if it froze, it would remain at whatever it had been reading when it got too cold. Happy to be corrected if any Q400 bods know different, of course.