Clock/No UART

[FTLE420]

Having an issue with one of our 81C clock controllers. It seems the active clock isn't seeing the inactive clock causing a DTC010. Posted below.
ssck 0 full
ENBL
CLOCK ACTIVE
GROUP 1
SIDE 0
CLOCK CONTROLLER - LOCKED TO LOOP 22
PREF - 22
SREF - 51
AUTO SWREF CLK - ENBL
NO UART

CARDID: NTRB53AA26NNTMENC87JG6

BANK 0 FIRMWARE VERSION: 019
BANK 1 FIRMWARE VERSION: 016

ACTIVE BANK: 0
FPGA VERSION: 014
CLOCK TO CLOCK CABLE: PRESENT


.ssck 1 full
ENBL
STANDBY
GROUP 2
SIDE 1
CLOCK CONTROLLER - LOCKED TO LOOP 22
PREF - 22
SREF - 51
AUTO SWREF CLK - ENBL
NO ERROR

CARDID: NTRB53AA26NNTMENC87JF8

BANK 0 FIRMWARE VERSION: 019
BANK 1 FIRMWARE VERSION: 016

ACTIVE BANK: 0
FPGA VERSION: 014
CLOCK TO CLOCK CABLE: PRESENT


My question is should I have a maintenance window when switching clocks and is the different Firmware Versions an issue?
Switch is:
Version 3621
Release 4
Issue 50 W +

 

[FTLE420]

Ok, went ahead and did it inspite of what I've always heard about the switches resetting itself when doing anything in the core cabinets.
SWCK in ld 60.....ok
Checked to make sure it switched
DIS CC 0 in ld 60......ok
SEFT CC 0 in ld 60.......selftest passed
Cleared the NO UART.....Now No Errors.
Switched back.