On the MER7775WS, we were told that we can put in the cooking temp/time for the regular oven and the system would convert it to convection oven by a push of the button. However we are not able to find any data on the convection portion of this oven on line. Do I have this feature or not???

SOURCE: inacurate temp

The follow suggestions apply if you are at sea level, or a bit above. If you are in the mountains, you'll have to compensate for altitude issues. You need an accurate thermometer to be spot on. One way is to use an electronic thermometer. Another is to set the oven to 217 degrees, insert a small pan of water into the oven, with a metal tray or pie tin on a lower rack to catch spills and see if it eventually boils. If the water didn't boil, you can adjust the temperature upward in  5 degree steps (see your owner's manual for details). If you've lost your manual, you may be able to go on-line and get a pdf copy of your manual.If the water does boil, you know your oven is accurate within 5 degrees. You can then proceed to re-do the experiment at 212 degrees, if you wish. Then you may use the data to adjust the oven temperature.

SOURCE: oven will not stay on when baking regular none at all, convection have to set a couple of times

I had a similar problem when you turn the oven on it would shut off either on broil or bake,I tried switching the lock for the oven cleaner back and forth and now the oven works.

SOURCE: How do I calibrate the oven temp?

Oven Temperature Adjustment Option for the MSG5770
If you think the oven should be hotter or cooler, you can adjust
it yourself. To decide how much to change the oven temperature,
set the temperature 25°F higher or lower than the temperature
in your recipe, then bake. The results of the “test” should
give you an idea of how much to adjust the temperature.
To adjust the oven temperature:
1. Press the BAKE pad.
2. Enter 550° by pressing the number pads “5, 5, 0”.
3. Press and hold the BAKE pad for several seconds until 0°
appears in the display.
4. Press any number pad to change the temperature. Each time
a pad is pressed, the temperature changes by 5°F.
• Press repeatedly to reach +35°F. Continue pressing
to reduce the temperature up to -35°F.
• If the oven temperature was previously adjusted, the
change will be displayed. For example, if the oven
temperature was reduced by 15°, the display will
show -15°.
5. When you have made the adjustment, press the
CANCEL pad and the time of day will reappear in the
display. The oven will now bake at the adjusted
temperature.
NOTE: Do not change the temperature setting more than
10° at a time before testing the oven.
It is not necessary to readjust the oven temperature if there
is a power interruption. This adjustment will not affect
broil or clean temperatures.

SOURCE: How do I use the self-cleaning oven feature

An easier option for you would be to download a replacement manual. Go to managemyhome.com and register. This is a FREE service. Once registered, log in and go the "Home Manager" link at the top of the page. Look for the "Owner's Manual" link under the drop down menu and click on it. Enter your Brand Name and Model Number. Your Owner's Manual is listed in a downloadable .pdf format that you can save to your computer or print out for ready reference. I hope you find this information helpful. If you have further questions, please let me know.

SOURCE: convection oven fan keep shutting on and off

You do not list a model number, so I can not confirm this, but I suspect what you are hearing is not the convection fan, but a cooling fan, designed to come on at a certain temp to keep the control area from getting too hot.