I have a 30 year old GE wall oven (with microwave in addition) JKP67G. The interior temperature of oven is not the same as on the switch. It's also prone to temperature swings from below to above the set temperature. Adjusting the tep gauge doesn't do the trick. I purchased a new thermostat WB2x0234. However, I do not have a repair/service manual for the installation. Can anyone help? My husband is going to do the install. ดูหนังแอ็คชั่น