I think they are trying to find a company that can do the job.
For 1301K it is not a surprise if they would prefer to outsource it
to a 3rd party to do the job. That kind of damage that it has
sustained is BER* and they would rather find a company to repair
1301K, same goes for 5026D 5031M.
*Beyond Economical Repair
I can't speak for 1553A and 1567K but for the case of 1301K most
likely it is.
Please check your definitions, Beyond Economical Repair would
mean scrap, because the repair cost is higher than the value of the
asset.
If its done by a third party, it simply means that the third
party either has the capabilities to do the repair (where there
isn't such capabilities in house) or that they can do the repair
cheaper than done in house. It is still an economical repair.