I cannot get a full cup of coffee from my Keurig

I HAD A SIMULAR PROBLEM...AFTER DESCALING WITH VINIGAR I NOTICED THAT MY COFFEE CUP WASNT ALWAYS SERVED FULL....THEN AFTER A LITTLE DIGGING ON THIS SITE IT BECAME OBVIOUS....I HAD A PIECE OF SOMETHING STUCK IN THE ONE WAY VALVE...SO TO SOLVE THIS I DISCONECTED MY KEURIG,BROUGHT IT OUT TO MY SHED AND CAREFULLY BLEW OUT THE THE ENTIRE UNIT WITH MY AIR COMPRESSOR BEING CAREFUL NOT TO USE TO MUCH PRESSURE AND BLOWING OUT A SEAL.....BROUGHT IT BACK IN,FIRED IT UP,WORKS PERFECT AGAIN...EVEN THE DESCALE LIGHT NOW STAYS OFF.NO MORE PINCHING THE RUBBER RETURN VALVE IN THE RESIVIOR JUST TO BREW A CUP OF COFFEE. HOPE THIS HELPS SOMEONE........................