When Tv Excelsior had any signal loss the mascots of the channel, Ritinha and Paulinho, would sing this jingle:
"Não desligue, não! O defeito é nosso. Estou fazendo o que posso pra consertar sua televisão!'" (Please don't hang up, it's our fault. I'm doing what we can to fix your television!)
To this day, no recording of these incidents are avaliable.
UPDATE 12/10/2021
The instrumental version has been posted to YouTube (Track 10 )
https://youtu.be/1GJ08daTFE0
https://www.sampaonline.com.br/embalagemecia/colunas/elmo/coluna2001ago10.htm