I don't own a Lenni but I bought a used 2007 APQS Millie in 2014. It is still running strong. Have you gotten onto the APQS website? APQS.com, then pull up the Forum. You can ask questions of other Lenni owners. APQS is known for long running machines. If you bought a new one, you get a lifetime warranty. Their service is great, both in person and assisting over the phone.
You can also get an idea of cost for that machine. Get the serial number from the seller and call APQS.