Tcase is 72c, however what you're measuring is not Tcase, but core temperature. Tcase is the temperature of the top of the heatspreader, which we have no way of measuring, making it an effectively useless metric.
On mobile CPUs which don't have heatspreaders (but are physically the same chips) maximum temperature is throttling temperature, which is 100c. 76c is a perfectly fine and safe temperature for these chips to run at.