Sansui AU-717 integrated amplifier

When I turn on the amplifier speaker protection circuit LED flickers for about a minute and then the LED goes on steady.
Also, there is a small pop out of the right speaker. Unit then plays well. The LED light used to flicker for a few seconds but now over a minute. Checked all connection.
I would appreciate any suggestions.
Thank you,
Google is your friend for this one. Check for several threads concerning AU-717 protect mode issues.
Time to upgrade.