Hi Gentlemen,
Took my 990 out of the box after being dormant for 21 months (batteries removed and stored in original box) and inserted/charged the batteries in the remote. Found that the #2 key (top row, middle) didn't work anymore. No signal is being transmitted to the base when pressing it. Called up Lionel Warranty Service and got quickly connected to a service rep. I got an RA and the rep said they will fix it under warranty. I can send it in after the holidays. I am still impressed with Lionel service.