We bought a house that was remodeled in 2015 or so, and it has undercabinet lights that are outdated. Each strip has its own switch (ugh) and one critical section doesn’t work. Money is tight, or I’d be replacing all of them asap. Here’s a pic of a working strip, and a pic of a part I took out.

1. Can anyone help my identify the brand so I could maybe get a replacement part, and

2. can anyone suggest a replacement system I could install myself?