1987-88 is right. The Electrolux man called on me at my business (in a downtown area) regularly back in those days, so i was very familiar with the models then.
That model was called a Marquis (pronounced Mark-Key),,and the next model in the line up was called a Grand Marquis.
This was one of the last "all metal" bodied Lux's before they went all plastic. Yes, the motors were prone to be weak on this model for some reason.
I bought a brand new Marquis in 1988,,and the motor blew out in around 1992.
Electrolux did replace the motor for free,,i think mostly because i was a good customer. I remember the Sidekick mini PN was a new feature at the time, and cost extra.
If i remember right, Electrolux was selling the Plastic bodied machines at the same time.
Seems like a Marquis was around 699.00 new, and the model LE (all plastic) was 499. Both had the same PN.
The Discovery 3 upright was 299.00 by itself, or 359 with attachments i believe.