Stress testing your boat

[desirableroasted]

I play with sabotage and malfunction on, which sometimes offers unexpected thrills out on patrol. So now I stress test my boat on the way out... Since I suspect many of you do, too, was wondering if we could compare notes.

Here's my list... your advice on additions would be appreciated. And deletions, too, if there's nothing here that's been known to fail.

Engine plant/movement
1) Achieves full rated speed on surface (with correct acceleration)
2) Ditto for going into reverse.
3) Achieve full rated speed submerged; ditto reverse
4) Submerges in rated time
5) Maximum range at speed figures are right (I use 8 knots as a guide).

Weapons station
1) Optics working correctly for both scopes
2) Tube doors open and shut properly

Deck
1) Deck gun sights are properly aligned (I usually blow a lifeboat off Tirpitz from about 1000m out; they don't seem to mind).
2) Ditto flak.

Hydrophone
1) Detecting properly (I usually use "our" screening destroyers as "targets").

Obviously, some of this can't be checked until I clear harbor, and some of it needs to be rechecked during patrol (max range at speed, for example).

What am I missing?