Sound as if the noid is either worn or been damaged, possibly by overpressurising from the LPR? They can also leak from gasket that seals it into the housing. It may be fixable but may need stripping down to sort out.
Are you 100% sure the leak is coming from the cocking solenoids? They are not easy to get in UK second hand, and very expensive to buy new. Hoses or barbs sometimes start leaking, and make it difficult to tell exactly where the air is escaping from.