How to assemble Grundfos CR, CRN 32, 45, 64, 90 pumps

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Dear GRUNDFOS, I am from Venezuela, a Mechanical Engineer, I sell and provide technical advice on these pumps through the Company located in Caracas, the capital, HIDROTECNIA BOMBAS ALECTRICAS, S.A. We are agents authorized by you to market under your license in this country. Please can you tell me what those 2 holes with plugs are that are at the base of the hydraulic body as shown in the video at minute 1, 53. I can also know what those other two upper holes in the lid of the hydraulic body are for, one hole with a plug and outlet hole and the other with a sealed plug that is shown in the video at minute 9, 35. Thank you and waiting for your valuable responses, Regards