Gear doors won't close on ground...

[atsiii]

This is a '68 T337C. My a/c just got out of annual, during which the gear swung fine. In prep for the first flight after annual, I opened the gear doors for inspection by using the emergency hand pump. However, when I turn on the master, the doors won't close when pumped. Does anyone have any ideas or things to check? I've cycled the gear handle from down-neutral to down and back several times to no avail.

I'm inclined to fire up the engines and try cycling the gear handle again, but I wonder if that could hurt anything if a solenoid was stuck. On a previous T337 I once had a similar intermittent problem of the doors not closing, which turned out to be the micro-switch at the hydraulic pack. But I've never had a problem with the doors on this a/c, and it seems strange since the a/c has not flown (or even started) since its annual. What thinks ye?

Thanks in advance!

Allen
atsiii@ceoexpress.com