The test connections could have been used to defrost the frozen O‑rings.
All that needed to be done was replace the compressed air with warm air!
The only extra thing needed was for a small vent to be drilled in the annular gap diametrically
opposite the air input. This vent is necessary to enable exhaust air to escape after having
flowed freely around the annular space, defrosting the O‑rings as it passed by. The
O‑rings could have been heated to whatever the launch directors wanted. The vent would
also act as a drain-hole for water that sometimes seeped into the joint and would only need
to be plugged when pressure testing.