It had old fuel in it, had just a little miss. It has 20360 miles on it. Think it was parked for 2 years...
Everything shown in your earlier photos is pretty common if / when these rubber components related to intake / fuel systems have more than 10 years since new. The only abnormal damage is on the 4-into-1 breather vent tube (between crankcase and Throttle-bodies) - clearly someone has pulled on the TB before removing the tube clamp at crankcase - this part will crack over time but NOT the way your photo show.
The usage of Ethanol in fuel in North-America has made this wear issue of rubber / plastic parts always in contact with fuels even worse than in 1970 or 1980 era. Of course, the damage of Ethanol is even more visible on an inactive vehicle with stagnant / stale fuel.
I am currently working on a 2001 K1200RS (with 34,000 miles) that was parked for 4 years - it was bought by a friend that does not work / fix his own motorcycles... When he bought it used 4 years ago, it was not planned that it would stay parked for so long, but a series of unforeseen circumstances have delayed the import of the bike back to his home.
Given 15 years experience with aging rubber components on these K1200RS/LT (intake and fuel systems), I am just replacing everything suspect. Even the injectors where tested (1 jammed and 1 dead) - hence all injectors O-RING were also replaced (top and bottom). The fuel system was tested with a fuel pressure gauge to confirm no internal / external leaks AND a good / functioning fuel pressure regulator.
Of course, the fuel filter was changed and also the 2 hoses connected to it - these short hoses under constant pressure tend to crack after 10 to 12 years of age on average (see last photo...).