Although it is not always mandatory when deferring a defect, a certifying technician must issue a CRS if a prior analysis has been required or a maintenance action has been carried out.

No, as set out in the EASA-FAA bilateral agreement, only FAA Form8130-3 Rebuilt for engine are acceptable, as set out in point 10.11.1.6 “Engines rebuilt by the PAH can be accepted as specified in the TIP associated with Annex 1 of the Agreement.   “Rebuilt Engine” means an engine that has been disassembled, cleaned, inspected, repaired as necessary, reassembled, and tested to the same tolerances and limits as a new item by the production approval holder in accordance with 14 CFR part 43.

There is no limitation in the standard or in the EASA guides that prevent a certifier from performing critical tasks in its first year.  
However, the organisation may add additional requirements in its maintenance organisation manual.

RESPUESTA DE EASA

The following aspects to be taken in consideration:

• it is possible to release component maintenance on an internal release document (IRD) when this component will be installed on an aircraft by the same maintenance organisation (145.A.50(d));
• The CAMO/operator of the aircraft should be in agreement; and 
• all the information normally required for an EASA Form 1 should be adequately detailed in the IRD (and in MOE procedure). In this case the IRD is considered to be equivalent to an EASA Form 1 for 145.A.42 purpose

A summary table on the applicability of the payment of fees is included:

This applies both to remote audits carried out by the competent authority and to remote audits carried out by approved organisations to their own suppliers and subcontractors. 
Authorities/organisations that decide to use remote audits should describe the functioning of remote audits in their procedures and should consider at least the following points:

If an organization wants to carry out maintenance on temporary fire bases and it is not a case of AOG or occasional maintenance, that is, if you want to make use of fixed facilities (warehouse, office, etc.) and it is estimated that the use will be greater than 40 days, you must request the opening of a line station for each location.  
Otherwise, support could be provided by a mechanic on board / traveling in a van if the need to request opening of installation (although defining in the EOM the necessary procedures).

EASA ANSWER:

Line stations staffed with one person (the certifying staff) contracted externally may require attention, in particular ensuring:

Yes, provided that it has continued to apply the requirements of point 2.8 of AMC 2 of 145.A.50(d) to re-incorporate the component into the EASA system. 

The EOM Evaluation Guide indicates, in the functions of the Compliance Control Officer in section 1.4.2, "7". It is responsible for the preparation of standard practices and procedures (including the EOM and associated procedures) for use within the organization, and ensures their adequacy with respect to Part 145. Could the Maintenance Manager perform this function and then the Compliance Control Manager give the go-ahead?