The search terms I've used on google:
Praktica L service manual; Praktica L repair manual; Praktica L IPB; Praktica L parts diagram.
I don't think one exists but if it dies a factory authorized service shop still open for business might have one.
The exploded view exists, within the official repair manual. But in the only pdf file online, those pages missing; and a photo on the net of these pages is not readable.