1st off, the beer will be fine. Don't worry about it. 75 degrees is a little high for fermentation temps, but yes indeed, most yeast will produce enough heat during fermentation to raise the temp 4 or 5 degrees above ambient. Most home brewers will try to keep the fermenting temp below 70 to produce a cleaner beer as yeast will throw off a lot of esters than can provide a bunch of different and not always desirable flavors. The rule of thumb is to generally maintain your fermentation temps in the mid 60's for at least the first day and a half on ale fermentations. After that, the yeast have gotten through the growth phase and the resultant ester production is far less of a problem. Be patient. Give the yeast time to finish their job. When you think the fermentation is done, take a gravity reading, then check it a day or two later to see if it has changed. If not, you're good to bottle or keg. Enjoy the hobby, it's kept me entertained for nearly 30 yrs. We'll look forward to seeing your posts bigpete. Cheers.