A few nice weber gas grills images I found:
The New Manifold
Image by Another Pint Please...
For about two months,  I have had problems lighting number 4 burner.  It would spark and flow gas, but for some reason not light off of the spark.  After several cleanings and no luck, I contacted Weber customer service.  In their typical fashion they helped me out and shipped a new manifold.  After fifteen minutes of work I had her up and running again...no problems.
Removing the old manifold
Image by Another Pint Please...
For about two months,  I have had problems lighting number 4 burner.  It would spark and flow gas, but for some reason not light off of the spark.  After several cleanings and no luck, I contacted Weber customer service.  In their typical fashion they helped me out and shipped a new manifold.  After fifteen minutes of work I had her up and running again...no problems.
Sliding the old manifold out
Image by Another Pint Please...
For about two months,  I have had problems lighting number 4 burner.  It would spark and flow gas, but for some reason not light off of the spark.  After several cleanings and no luck, I contacted Weber customer service.  In their typical fashion they helped me out and shipped a new manifold.  After fifteen minutes of work I had her up and running again...no problems.