OLD GE Wall Oven doesn't heat properly

Question

Very old GE oven D10401WH Serial SAD92118 doesn't properly. Seems to heat although the temp light isn't working on Broil. Heats minimally on Bake , I unhooked and tested the bake elelement (23 ohms). Testing voltage on the bake leads into the oven shows 121 volts on bake, 32 on timed bake and 240 on broil. Should the bake leads show voltage on broil? Do the different voltage levels indicate I have a power problem or possibly a switch problem? Thanks.