To my knowledge those are casting lines made when the block was cast. I personally have seen them many times and wouldn’t worry about them. Remember read my signature.
Now I’m confused, as both those numbers come up as 28” models. One model has both a 28” deck available and a 30” deck available. To me it may be possible. Use these three web sites for see if they can be interchangeable. Very hard for us to give you reliable information, because we don’t have...
Has anyone checked to see if the deck is sprung from hitting something. Might have happened when someone hit something and people started throwing parts at it. Doesn’t sound like people are checking for all possible causes, just assuming they know the problem without checking.
Check battery voltage while turning the key to the start position. If battery voltage drops below 10 VDC the battery is shot and needs replacement. Wouldn’t be the first time the battery reads good, but drops under load.
If you feel it is rough when spinning by hand, go to dealer now. Be proactive and do not wait. Let them grease it if that’s what it needs. You will also have a record if something happens down the line. That’s why you have a warranty.
Nothing surprises me any more. That’s why I try not to assume anything and check everything I can think of. Making mistakes has been my #1 learning tool.
Don’t know what manual you have, but page 7 of this manual tells you exactly how to check oil level.
https://bsintek.basco.com/BriggsDocumentDisplay/default.aspx?filename=mssAJP-K_ny7tH217FzoPu
I definitely agree, but first check your oil level and see if it smells like gas gas. If the level is high and it smells like gas you’ve found your problem.
Without knowing the model and serial numbers for both units we would have to offer guesses only. Guessing normally ends up costing $$$$, so we request that you provide us with those numbers if you don’t to spend a lot.