There was a bulletin on the quick disconnects. It only amounted to seeing if they were cracked at the time though. Mine broke about 6 months after the bulletin was done on my bike . Just like yours, it was only one of them. I temporarilly placed a brass barbed spline in the line and used 2 worn type hose clamps to secure it.
The real fix is to replace it with the metal Quick Disconnects that BMW should have used in the first place. I am sure someone will jump in and show you a source for those.
Also....please go here and fill out a report with the NHTSA . If enough of us do this we may get BMW to actually change this part out to a safe part.
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747,891 miles on touring motorcycles since 1990
IBA 45658 MOA167437
2000 LTC 90,600 miles KIA (new)
2003 LTE 164,188 miles Silver (Purchased with 1687)
2008 R1200RT 176,196 miles (Purchased with 16458)
2017 R1200RT 96,669miles (new)
Total BMW miles 509,508
1982 GL1100 rode 84108 miles (bought with 12012 sold 96120)
1988 GL1500 rode 12067 miles (bought with 19893 totaled 31960)
1989 GL1500 rode 142208 miles (bought with 20302 sold 162510)
Goldwing miles 238,383