If the freehold company can opt to repair and has not assigned all those duties to the Man Co in the leases, it can use its funds, and recover the balance of its costs from shareholders, if they all agree, and any non participants in service charge via the Man Co.
The man co can also agree to allow the freeholder to do this work, however if the man co is made up of all leaseholders, and the freeholder company only some, this may raise objections as the man co would have to get 100% agreement from its members.
it sounds like poor advice, normally if there are less than 100% participation in the freehold purchase, you would treat the % due from non participants as loan capital which is repayable ( through the sale of lease extensions or buying into the freehold) thereby reducing tax liability.
Based on the information posted, I offer my thoughts.Any action you then take is your liability. While commending individual effort, there is no substitute for a thorough review of documents and facts by paid for professional advisers.