What do you do if you have something broke on your airplane and you don't have an MEL? Call Dr. PHIL!
Determine if its required....FARs, POH, ADs
Remove or deactivate.....Can you remove it as a pilot? What about deactivating it?
Placard it...INOP sticker
Hazard...does the inop item pose a hazard to the aircraft or flight? See 91.7
I (forget about "I" it doesn't fit anything)
Log it...Log book entery