I finally found where EchoLink stores it's  "Welcome to AllStar Node XXXXX EchoLink Node XXXXXX Systems Linked" prompt.

The text can be found and modified in: 

/usr/src/utils/astsrc/asterisk/channels/chan_echolink.c

Use the nano Control+W to find the text "Welcome to AllStar"

Example, to add a new line before the status display, I changed this line 

"oNDATA\rWelcome to Allstar Node %s\r" to

"oNDATA\rTEXT HERE FIRST\rWelcome to Allstar Node %s\r"

(Directory may be different depending on distro: this is Jeremy's W0JRL for the Raspberry pi 2

Then in the /usr/src/utils/astsrc/asterisk

You have to run

./configure

make menuselect.makeopts

make

make install

asterisk-restart

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