Gear doors won't close on ground...

[Bandit 153]

1974 G: Gear raises and doors close on retraction and amber light illuminates; however when gear down is selected gear extends and locks but gear doors do not close. Green light does not illuminate and gear warning horn sounds with throttles retarded. Power pack motor runs for 30 seconds and then circuit breaker pops as it should. Anyone know what is causing this? Micro switches have been checked good. Thanks.