UPDATE (Jan. 8, 2016): Many thanks to Lionel on their quick turn-around in removing the "flash boards" from the two, two-car sets of North Pole Central passenger cars (LINK: No. 6-35250) of mine.
It was a bout a week from the time I shipped them to Lionel to when they arrived at my house yesterday. I put them on the Christmas layout (still up) & the lighting was repaired perfectly. Thanks very much to Lionel & its repair department for covering this issue on a "new-old stock" item than was manufactured incorrectly. Lets give credit where credit is due.
OLD POST: I bought them in recent years (one in 2013, the other in Oct. 2014) & am disappointed to learn ALL these cars were mistakenly built with circuitry from the Harry Potter "Dementors car," No 6-35229.
The circuit board makes all interior lights flash rapidly, whether the cars are moving or in neutral & parked. Have buyers had to re-wire their own cars personally to bypass the stupid circuit board, or is Lionel willing to repair these due to their manufacturer's mistake?
Unfortunately, although I opened these & placed them on the track for the FIRST time today, both sets are beyond Lionel's three-year, "non-warranty" policy.