Have a Jenn-Air DW871UQW that does not always drain. Pump and motor working fine.

I watched a wash cycle with a multimeter on the solenoid terminals. On first drain cycle, the solenoid got proper voltage and engaged but power was only on for 3-5 seconds but solenoid still remained in engaged position. I assume water pressure in drain value kept solenoid in that position, it ultimate went back to non-energized position. I read one

Second drain cycle was like the first, voltage on applied for 3-5 seconds.

Third drain cycle, the voltage to the solenoid lasted 2 mins plus.

So, I am thinking the solenoid is working fine since it engages ever time there is voltage.

I am thinking that timer may not be supply voltage to solenoid for necessary time

My question is, where can I go to see document to know how long drain cycle voltage should last?

I am guessing that timer drain contact may be pitted and need some file work but i have not taken the timer apart.

Anybody know where I can determine drain cycle timing for my timer?

Anybody have comment on if this anything other than time?