you might not hear it over the engine - the car will produce very little boost when sat stationary and by the time you're rolling with fans, wind noise, radio, road noise, engine noise all the rest then it is possible that you wouldn't hear it.
The bottom hoses are prone to rubbing and splitting on the bell housing, but given that once you've got the engine tray off (if it is even still on!) then it is a real easy job to undo the two clips that hold it on.
Once off give the pipe a good squeeze and roll it around in your hand to look for signs that it has split. Remember that even the smallest of hole will get considerably bigger under 1.5bar of pressure, so even a pin ***** can turn into something the size of a 5p.
The top hose is a little more fiddly to remove due to access but I think can be done from the top from memory (could be wrong as its been a while). its still held by the same 2 clips mind. do same with this one.
My top hose actually split on the kink just after the manifold right above the battery on the back/bottom side and I didn't see it until I got it off and noticed the black sticky mess.
You can get a new pipe - autolusso do some shiny blue expensive replacements but it will last a good while. Personally when mine went I bought some alloy pipe (I think its 2inch) and some suitable turbo hose clamps of the right size and cut out the offending part replacing with alloy. That's assuming its not on a bend or anything. You know dam well alloy aint gonna pop.