Bought car at 55,000 miles. Its a 6 speed manual. Decided to change transmission fluid at 60,000. pulled Drain plug nothing came out. I figured someone at Walmart or Toyota had mistaken drain plug for oil drain plug. Previous owner had records of oil changes from both. completed fluid change and made sure everything was tight. Checked for leaks by driving around the block a couple of times. did not notice anything. Fast forward 1000 miles later, noticed oil pooling on top of tranny around this bolt. see picture. cleaned oil and inspected area. unloosed this bolt to see if it was loose. didn't really come off easy to indicate it was loose but easier than i believed it should of have. tranny made a hissing sound like trapped air was escaping when bolt was pulled. re tighten to 30 ft-lbs. inspected drain plug seemed fine. noticed hairline cracks on casing. around top bolt and drain plug. Alright im gonna ask, although i believe i know the answer. Are these cracks normal? They do not look normal. im gonna drain fluid again and redo the fluid change. try to pin point the leak exactly. but im at a loss. i worry that driving this with no fluid for as long as we did has cracked the tranny. and the fluid im seeing is escaping from these cracks. these pics are after i wiped it up ill take before pics next time.thank you for your time.