2002 C320 Electrical

Hi All,
Hoping this group can help me out before having to go to dealership. Have read thread about '01 C240 & hope seat motors are not at fault here.(thanks
for the link BTW)
March 2nd: "User Elec. Product" comes up on LCD display with battery icon. Go to local service station; guy tests battery & cold crank amps are low. Replace OEM Battery.
Meantime. Toggle switch to "moonroof" doesn't work. "stuck" open unless I want to manually crank it closed.
March 8: Same display on LCD screen. "User Elec. Product" and a battery icon on LCD.
Guy at service station claims he *did* check alternator. Didn't see him tho... Didn't even move car to service bay. Fellow might not be sharpest knife in the drawer. He was using a pry bar to try to get the battery loose when I went over and told him there's probably a tie-down for it down there.
Prefer *not* to go back to that filling station, but if it's their fault-- they need to fix it. Either that or cut my losses & go to dealership.
Even so, how would changing battery explain moon roof switch? Spate of bad luck?
Any ideas suggestions greatly appreciated.
thx --Bruce
San Antonio, TX

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.