Once the outside access panel is removed, look at the lower left area of the heater "stuff" behind a metal pipe that loops around down there. While are out there, check out the location and function of the pressure relief valve, also located on the outside of the WH. There is a procedure for restoring the "air bubble" in the hot water line written somewhere in your Owner's Manual. Also, in that area, of just right bottom center, you will find the big hex nut which is the base of the anode rod. That rod needs to be checked and probably replaced every year or so, depending on the level of mineral content in the water and amount of use. You will need a socket or wrench which is the right size for that nut..it is larger than most.
Best,
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