Here is the pop bumper arrangement from Mibs, made just a few months before Road Race. It's the same basic arrangement for most games I suspect. Your wire colors will be different but the basic operation should be the same.
Mibs pop bumpers (resized).jpg
The two normally open spoon switches in the upper right corner are the spoon shaped switches just below the playfield on two different pop bumpers. When the ball tips the pop bumper skirt on either pop bumper the spoon switch closes and sends power to the pop bumper relay (the H relay in this game) which activates the pop bumper relay.
When the H/Pop Bumper relay activates it closes its own normally open lock in switch to keep itself active (or locked in) after the ball rolls away and the spoon switch opens.
At the same time the H/Pop Bumper relay closes two other switches that send power to the pop bumper solenoids. These switches will have larger, high current contacts on them so they'll look a little different than the lock in switch which will have smaller, lower current contacts.
With the H/Pop Bumper relay active and power going to the two pop bumpers, the pop bumper rings pull down and should eventually open the two EOS switches mounted below the spoon switches. Once both EOS switches open the lock in circuit is broken and power is cut to the H/Pop Bumper relay.
When the H/Pop Bumper relay relaxes the two switches sending power to the pop bumpers open to cut power to the pop bumpers.
It sounds as though your H relay switches (at the bottom of the schematic) aren't opening. So either the H/Pop Bumper relay isn't relaxing or the H relay switches are gapped too close.
The pop bumper relay is usually mounted under the playfield near the pop bumpers it controls. You should see it fire any time a pop bumper fires. Shut the power off and manually operate the pop bumpers and the pop bumper relay and see if every switch opens or closes as the device activates and relaxes.