I have just started working with Exchange 2013 Server Health and wondered if anyone can point me to some useful guides to troubleshoot when a probe/monitor is unhealthy as there are quite a few in my environment ranging from OWA to RPS etc but cant see what the EXACT issue is or why its being flagged in order to rectify...

all I can find online is how to disable the monitor which is obviously not the correct thing to do...

If the environment doesn't have a dedicated monitoring application pre-installed you may like to use a couple of scripts to fulfill the task and later have them scheduled per your requirement. I lot is there on technet gallery . you may use the same or have them modified as per your requirement. one good script i found was from  Marc Nivens

https://gallery.technet.microsoft.com/exchange/Exchange-2013-Performance-23bcca58

http://blogs.technet.com/b/rmilne/archive/2015/04/06/exchange-2013-performance-health-check-script.aspx

Hi,

We have to make a concrete analysis of concrete problems.

Here's an article about Exchange 2013 Management Pack Health Sets, for your reference:
https://technet.microsoft.com/en-us/library/dn195892(v=exchg.150).as