Every time I use CSE these two lines appear in the Cpanel error log.
sh: line 0: export: `=': not a valid identifier
sh: line 0: export: `/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/bin': not a valid identifier
It does not seem to be causing a problem, just annoying.
I had this error also on one of our servers this morning and it was confirmed by cPanel techs to be caused by CSE. We replaced a drive and ran various upgrades on that system yesterday so not sure what actually caused these errors.