Kevin Ding reported today that Bynum has been dealing with discomfort in his right knee. I quoted the important parts of the article.

In this case, the revelation that Andrew Bynum has been dealing with another problem in his right knee isn't all bad. It offers further explanation for the dramatic decline in his recent play, and the issue toward the top of his kneecap felt better to him Monday night after he did the right thing and sought treatment for the discomfort.

Bynum also said he is past the two-week-old upper respiratory problem that Phil Jackson has been throwing out publicly as an excuse for Bynum's sluggish effort.

Bynum came into this season committing to wearing a protective brace over the right knee that housed last season's MCL tear and being more diligent about treating his aches and pains, learning from veterans Kobe Bryant and Derek Fisher.

As disappointed as the Lakers have been to see Bynum's initial fire dwindle into a flicker upon the return of Pau Gasol and the rationalization that the Lakers thus don't need as much from Bynum, they have to be pleased to see him being more professional in treating his knee.

Bynum was sitting in the corner of the Lakers' locker room before the game in Phoenix with an electrical stimulation unit attached to the top of his right knee. Asked if the stim was just maintenance or something more, he explained how the knee hadn't felt quite right recently and used the word "tightness" to describe a sensation that can happen toward where his kneecap nears his quadriceps. He said he had also been getting manual treatment on the area.