landing gear

I am having problems with the gear doors on my '67 337. The gear comes up and I get an amber light but the gear doors stay down. If I hold the gear selector up for a few seconds the gear doors will then close. They close fine when the gear is lowered.

And on a related note, what is the max speed for the gear doors down (140)? And what should I look for (inspect) with regards to damage if I have had the gear doors open at 190 mph because I wasn't aware they were open? Also, it has the rear door removal STC installed, so the main concern is the front clam shells and possible high speed damage.