Sorry for not posting anything sooner, I'm new to the forum and thought I would get emails about people responding.
Thanks for all your responses. I probably should have swapped it out just for my peace of mind, but I ended up just getting it welded on because I already had so much time into installing it. Also, P&M's customer service was very helpful and made me feel comfortable with having it welded on. They noted it in my warranty and promised I would be taken care of in the future if I had any issues with it. By the looks of it, it seems like it was an issue with a machine that cuts the steel. It looked like the machine cut into the steel too far at one point and no one caught it. The welder was pretty confident that I wouldn't have issues with that spot in the future.
I had it welded on Monday this week, filled it up Monday afternoon, and was burning wood shortly after. Its only been 5 days, but so far I've been really happy with burn. It seems like its burning less wood than my Central Boiler, but it hasn't been cold enough to really tell the difference. I'm heating a 5,000 sq foot home and a detached garage with in-floor heat. P&M recommends firing up twice a day and only putting in enough wood to last between fills. I feel like I'm barely putting any wood in and still have plenty of wood left between fills. I'm probably only putting in 1-2 large chunks and a couple smaller pieces each fill. Still learning and getting a feel for it. I checked the ash box this morning, and there really isn't much in there, so I'm pretty impressed with the quality of the burn too. There are mostly coals in the bottom of the firebox, not a lot of ash there either. I have the turn off temp set to 190 and the turn on temp to 180. My return temp is usually around 155 with a gauge I have strapped onto the pipe. I originally had the temperatures set to 185 and 175, but my return temp was a little low.
I do miss a couple things about my Central Boiler: the door size and the outside light. The 3444 has a nice size door, its not small by any means, but I'm just use to having a larger door. I've put some pretty large pieces of wood in the old Central Boiler and it ate them right up. I guess I'll just have to do a little more splitting with this boiler, which isn't necessarily a bad thing either. The outside light isn't really an issue either because I installed a light on a pole right by the boiler, but its just more of a convenience thing.
I was very unsure of my purchase after the leak and was tempted to return the boiler and try a gasser from some other brand. Brian from P&M has made me feel comfortable with the purchase and I do not regret buying it. They obviously covered the cost of the welding, but that was it. I feel like maybe I should have been compensated some other way with some kind of discount for my problems, but as long as they come through for me if I have any issues with that spot in the future I'll be happy. They seem like quality pieces of equipment and I'm really happy that I didn't have to switch to a gasser. Thanks again for your help!