buying used dvx100b-but how should i check the camera?

buying a used dvx100b from local.

camera pix provided show 50 hours

owners response to how was camera used was:
"used for 2 music videos and LOTS of Doc. interviews. This camera was used exclusively by me. It was never loaned out or rented out."

as to what tape: "Sony Premium tapes. never used no-name media.

So, how should i check out this camera?

Is there a on-site sticky that I'm missing which i could use as a checklist?

how to test the lens?
record some footage-with and without movement-and play back on his provided monitor

do zoom test and see if lens holds focus

how do i look for dead/stuck pixels?
i thought i read somewhere shoot an all-black cloth and see if there is any light bleeding thru. make sense?

for sound, engage each of the xlr channels?

check headphone output?

transfer footage to edit system to ensure the firewire is performing properly?

any and all thoughts would be VERY helpful.

thanks in advance in sharing your ideas

be well

rob